Fix typo
Merge pull request #239 from seanhussey/patch-1

Fix typo
Update Pester.psm1

relying on case sensitivity on Windows may cause difficulties. If names are normalized to lowercase, importing the module will cause all sorts of trouble as the tests will be executed, sometimes ahead of the non-test file.
Merge pull request #241 from JamesWTruher/patch-1

Update Pester.psm1