Correct typo in names of "IsPrerelease" methods

[per1234]

Previously, the method names contained an incorrect spelling of "prerelease".

In order to avoid making a breaking change, I left the incorrectly named methods in place in addition to the newly added correctly named methods. Since the incorrectly named methods were only added a few days ago, it is unlikely that they are actually in use as of now. So if you prefer, I am happy to remove the original methods to avoid clutter in the API.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (bc29313) to head (71fd327).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #27   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines         1138      1138           
=========================================
  Hits          1138      1138           

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[cmaglie]

Could you remove the wrong-named methods?
We are still in the "alpha" 0.14.0, so breaking change is permitted.

[per1234]

I made the requested change:

https://github.com/bugst/relaxed-semver/compare/e5e3a924ea1cad61ee0a40cb56a971b155385865..71fd327c3a0e88fb0570e629a50e9ed163bfe8e6

[cmaglie]

Thanks @per1234!