Fix force unwrap false positive. Fixes #721

[daniel-beard]

• Fixes force_unwrapping: False positive inside of strings when used as opt_in_rules #721 where force_unwrap is incorrectly triggered in the case of print("\(xVar)!")

[codecov-io]

Current coverage is 89.46%

Merging #723 into master will decrease coverage by 0.45%

@@             master       #723   diff @@
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  Files            72         72          
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- Hits           2141       2139     -2   
- Misses          240        252    +12   
  Partials          0          0          

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[jpsim]

Thanks @daniel-beard!