Add ! To MRI Function To Fix 'Exists' Error
Add ! To MRI Function To Fix 'Exists' Error

While I had trouble reproducing it, sourcing my .nvimrc would
occasionally cause the following error:

```
Error detected while processing /Users/patrick.regan/.vim/bundle/neomake/autoload/neomake/makers/ft/ruby.vim:
line   40:
E122: Function neomake#makers#ft#ruby#mri already exists, add ! to replace it
Error detected while processing function <SNR>136_NeomakeCommand..neomake#GetEnabledMakers..neomake#utils#GetSortedFiletypes..CompareFiletypes:
line    1:
E171: Missing :endif
Error detected while processing function <SNR>136_NeomakeCommand:
line    2:
E171: Missing :endif
```

Adding the `!` character forces the function to be overwritten.

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