Tests: constrain sqlite3 to ~> 1.3.13
Tests: constrain sqlite3 to ~> 1.3.13

Hopefully fixes:

```
LoadError:
  Error loading the 'sqlite3' Active Record adapter. Missing a gem it depends on? can't activate sqlite3 (~> 1.3.6), already activated sqlite3-1.4.0. Make sure all dependencies are added to Gemfile.
```

airblade/paper_trail,airblade/paper_trail