Add fix to properly handle versions with ~ and locked versions

[jennyEckstein]

No description provided.

[codecov]

Codecov Report

Merging #242 (7e41f3b) into develop (fa5a8ba) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           develop      #242   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           81        86    +5     
  Branches        16        17    +1     
=========================================
+ Hits            81        86    +5     

Impacted Files	Coverage Δ
lib/index.js	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fa5a8ba...7e41f3b. Read the comment docs.

[eaviles]

I thought the plan was to create a "utils.js" file with only the exec function on it so we could skip it from the coverage. Let's do that instead of creating one file for every single function.