removed extra path
removed extra path

```
root@localhost:~# cd letsencrypt/
root@localhost:~/letsencrypt# ./bootstrap/install-deps.sh 
Cannot find the letsencrypt bootstrap scripts in ./bootstrap/bootstrap

```

However, with the proposed change

```
root@localhost:~/letsencrypt# ./bootstrap/install-deps.sh 
Bootstrapping dependencies for Debian-based OSes...
Ign http://mirrors.linode.com jessie InRelease
Hit http://mirrors.linode.com jessie-updates InRelease  
```
dietsche/letsencrypt,hsduk/lets-encrypt-preview,thanatos/lets-encrypt-preview,mitnk/letsencrypt,bsmr-misc-forks/letsencrypt,xgin/letsencrypt,BillKeenan/lets-encrypt-preview,jtl999/certbot,sjerdo/letsencrypt,martindale/letsencrypt,twstrike/le_for_patching,hsduk/lets-encrypt-preview,TheBoegl/letsencrypt,ghyde/letsencrypt,sjerdo/letsencrypt,twstrike/le_for_patching,bsmr-misc-forks/letsencrypt,TheBoegl/letsencrypt,VladimirTyrin/letsencrypt,BillKeenan/lets-encrypt-preview,VladimirTyrin/letsencrypt,DavidGarciaCat/letsencrypt,goofwear/letsencrypt,DavidGarciaCat/letsencrypt,kuba/letsencrypt,lbeltrame/letsencrypt,letsencrypt/letsencrypt,lmcro/letsencrypt,wteiken/letsencrypt,mrb/letsencrypt,xgin/letsencrypt,lmcro/letsencrypt,Sveder/letsencrypt,brentdax/letsencrypt,stweil/letsencrypt,mitnk/letsencrypt,brentdax/letsencrypt,jsha/letsencrypt,kuba/letsencrypt,ghyde/letsencrypt,martindale/letsencrypt,stweil/letsencrypt,jsha/letsencrypt,piru/letsencrypt,piru/letsencrypt,goofwear/letsencrypt,letsencrypt/letsencrypt,wteiken/letsencrypt,Sveder/letsencrypt,dietsche/letsencrypt,mrb/letsencrypt,lbeltrame/letsencrypt,jtl999/certbot,thanatos/lets-encrypt-preview