Add upgrade file from 0.1.0 to 0.2.0
Add upgrade file from 0.1.0 to 0.2.0

As compatibility was checked with CI tests, this is simply a copy:
```
cp release/crankshaft--0.2.0.sql release/crankshaft--0.1.0--0.2.0.sql
```

To be automated in `make release` command.

CartoDB/crankshaft,CartoDB/crankshaft