Auto merge of #2427 - JohnTitor:diesel, r=jtgeibel

Update diesel related packages

This is also a step toward removing old proc-macro dependencies.
r? @jtgeibel

log:
```
Updating crates.io index
Updating diesel v1.4.2 -> v1.4.4
Updating diesel_derives v1.4.0 -> v1.4.1
Updating diesel_full_text_search v1.0.0 -> v1.0.1
```

Author: bors