Update dependencies
Update dependencies

Notable is RocksDB 4.3.1.

```
name                  old time/op    new time/op    delta
Select1_Cockroach       48.0µs ± 2%    47.2µs ± 1%    ~             (p=0.421 n=5+5)
Select2_Cockroach        936µs ± 3%     935µs ± 4%    ~             (p=0.841 n=5+5)
Insert1_Cockroach        483µs ± 1%     479µs ± 1%    ~             (p=0.222 n=5+5)
Insert10_Cockroach       875µs ± 2%     852µs ± 3%    ~             (p=0.056 n=5+5)
Insert100_Cockroach     4.70ms ± 4%    4.66ms ± 4%    ~             (p=0.690 n=5+5)
Insert1000_Cockroach    48.2ms ± 2%    48.2ms ± 2%    ~             (p=1.000 n=5+5)
Update1_Cockroach        739µs ± 7%     749µs ± 5%    ~             (p=0.841 n=5+5)
Update10_Cockroach      1.64ms ± 3%    1.62ms ± 5%    ~             (p=0.690 n=5+5)
Update100_Cockroach     10.0ms ± 4%    10.2ms ± 3%    ~             (p=0.151 n=5+5)
Update1000_Cockroach    90.7ms ± 9%    87.4ms ± 8%    ~             (p=0.421 n=5+5)
Delete1_Cockroach        773µs ±12%     742µs ± 9%    ~             (p=0.690 n=5+5)
Delete10_Cockroach      1.79ms ± 3%    1.66ms ± 1%  -7.58%          (p=0.008 n=5+5)
Delete100_Cockroach     13.6ms ± 8%    12.9ms ±10%    ~             (p=0.222 n=5+5)
Delete1000_Cockroach     147ms ±10%     142ms ±10%    ~             (p=0.151 n=5+5)
Scan1_Cockroach          214µs ± 3%     223µs ± 2%  +4.12%          (p=0.016 n=5+5)
Scan10_Cockroach         267µs ± 2%     274µs ± 1%  +2.65%          (p=0.008 n=5+5)
Scan100_Cockroach        653µs ± 2%     667µs ± 3%    ~             (p=0.222 n=5+5)
Scan1000_Cockroach      4.55ms ± 1%    4.69ms ± 1%  +3.02%          (p=0.008 n=5+5)
Scan10000_Cockroach     54.2ms ± 4%    55.1ms ±10%    ~             (p=0.841 n=5+5)

name                  old alloc/op   new alloc/op   delta
Select1_Cockroach       2.21kB ± 0%    2.21kB ± 0%    ~     (all samples are equal)
Select2_Cockroach       72.8kB ± 0%    72.9kB ± 0%    ~             (p=0.151 n=5+5)
Insert1_Cockroach       24.6kB ± 0%    24.6kB ± 0%    ~             (p=0.690 n=5+5)
Insert10_Cockroach      65.2kB ± 0%    65.2kB ± 0%    ~             (p=0.643 n=5+5)
Insert100_Cockroach      470kB ± 0%     470kB ± 0%    ~             (p=1.000 n=5+5)
Insert1000_Cockroach    4.18MB ± 0%    4.18MB ± 0%    ~             (p=0.841 n=5+5)
Update1_Cockroach       37.7kB ± 0%    37.8kB ± 0%    ~             (p=0.056 n=5+5)
Update10_Cockroach       105kB ± 0%     105kB ± 0%    ~             (p=0.167 n=5+5)
Update100_Cockroach      741kB ± 1%     742kB ± 0%    ~             (p=0.841 n=5+5)
Update1000_Cockroach    6.45MB ± 2%    6.38MB ± 1%    ~             (p=0.421 n=5+5)
Delete1_Cockroach       31.2kB ± 0%    31.2kB ± 0%    ~             (p=0.968 n=5+5)
Delete10_Cockroach      46.0kB ± 0%    46.0kB ± 0%    ~             (p=0.151 n=5+5)
Delete100_Cockroach      189kB ± 0%     189kB ± 0%    ~             (p=0.548 n=5+5)
Delete1000_Cockroach    1.75MB ± 0%    1.78MB ± 1%    ~             (p=0.190 n=4+5)
Scan1_Cockroach         11.3kB ± 0%    11.3kB ± 1%    ~             (p=0.286 n=5+5)
Scan10_Cockroach        15.2kB ± 0%    15.2kB ± 0%    ~             (p=0.222 n=5+5)
Scan100_Cockroach       47.4kB ± 0%    47.5kB ± 0%  +0.05%          (p=0.048 n=5+5)
Scan1000_Cockroach       336kB ± 0%     336kB ± 0%    ~             (p=0.690 n=5+5)
Scan10000_Cockroach     5.88MB ± 0%    5.88MB ± 0%    ~             (p=0.841 n=5+5)

name                  old allocs/op  new allocs/op  delta
Select1_Cockroach         49.0 ± 0%      49.0 ± 0%    ~     (all samples are equal)
Select2_Cockroach        2.34k ± 0%     2.34k ± 0%  +0.04%          (p=0.008 n=5+5)
Insert1_Cockroach          342 ± 0%       342 ± 0%    ~             (p=0.159 n=5+5)
Insert10_Cockroach         742 ± 0%       743 ± 0%    ~             (p=0.167 n=5+5)
Insert100_Cockroach      4.65k ± 0%     4.65k ± 0%    ~             (p=0.667 n=5+5)
Insert1000_Cockroach     43.5k ± 0%     43.4k ± 0%    ~             (p=0.968 n=5+5)
Update1_Cockroach          656 ± 0%       658 ± 0%  +0.37%          (p=0.016 n=5+4)
Update10_Cockroach       1.30k ± 0%     1.30k ± 0%  +0.12%          (p=0.016 n=4+5)
Update100_Cockroach      7.38k ± 1%     7.39k ± 1%    ~             (p=0.373 n=5+5)
Update1000_Cockroach     64.8k ± 1%     64.5k ± 0%    ~             (p=0.460 n=5+5)
Delete1_Cockroach          539 ± 0%       540 ± 0%    ~             (p=0.238 n=5+4)
Delete10_Cockroach         926 ± 0%       927 ± 0%  +0.11%          (p=0.016 n=4+5)
Delete100_Cockroach      4.72k ± 0%     4.72k ± 0%    ~             (p=0.556 n=5+4)
Delete1000_Cockroach     42.6k ± 0%     42.6k ± 0%    ~             (p=0.556 n=5+4)
Scan1_Cockroach            215 ± 0%       216 ± 1%  +0.56%          (p=0.048 n=5+5)
Scan10_Cockroach           295 ± 0%       296 ± 0%  +0.34%          (p=0.016 n=4+5)
Scan100_Cockroach        1.02k ± 0%     1.02k ± 0%  +0.14%          (p=0.016 n=5+4)
Scan1000_Cockroach       8.23k ± 0%     8.23k ± 0%  +0.01%          (p=0.008 n=5+5)
Scan10000_Cockroach      80.4k ± 0%     80.4k ± 0%    ~             (p=0.103 n=5+5)
```

sunya123/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,maxlang/cockroach,cockroachdb/cockroach,maxlang/cockroach,vivekmenezes/cockroach,glycerine/cockroach,sunya123/cockroach,arjun4084346/cockroach,cockroachdb/cockroach,sunya123/cockroach,petermattis/cockroach,paperstreet/cockroach,glycerine/cockroach,petermattis/cockroach,petermattis/cockroach,vivekmenezes/cockroach,maxlang/cockroach,bg451/cockroach,cockroachdb/cockroach,veteranlu/cockroach,arjun4084346/cockroach,paperstreet/cockroach,arjun4084346/cockroach,maxlang/cockroach,paperstreet/cockroach,arjun4084346/cockroach,veteranlu/cockroach,arjun4084346/cockroach,vaibhavarora/cockroach,vivekmenezes/cockroach,veteranlu/cockroach,petermattis/cockroach,vivekmenezes/cockroach,bg451/cockroach,cockroachdb/cockroach,cockroachdb/cockroach,veteranlu/cockroach,cockroachdb/cockroach,glycerine/cockroach,petermattis/cockroach,glycerine/cockroach,bg451/cockroach,maxlang/cockroach,glycerine/cockroach,bg451/cockroach,petermattis/cockroach,bg451/cockroach,veteranlu/cockroach,vaibhavarora/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,cockroachdb/cockroach,sunya123/cockroach,glycerine/cockroach,paperstreet/cockroach,arjun4084346/cockroach,vivekmenezes/cockroach,arjun4084346/cockroach,bg451/cockroach,petermattis/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,vivekmenezes/cockroach,veteranlu/cockroach,maxlang/cockroach,maxlang/cockroach,vaibhavarora/cockroach,sunya123/cockroach,veteranlu/cockroach,paperstreet/cockroach,vivekmenezes/cockroach,sunya123/cockroach,glycerine/cockroach,veteranlu/cockroach,petermattis/cockroach,glycerine/cockroach,vaibhavarora/cockroach,paperstreet/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,maxlang/cockroach,sunya123/cockroach,bg451/cockroach,vaibhavarora/cockroach,sunya123/cockroach