docs: fix casing of ParseLockfile in example code for lockfile-lint-api

[jonchurch]

Fix the example code for lockfile-lint-api. As it currently is, it fails because the casing of ParseLockfile is incorrect in the example. Seems the docs weren't updated after the casing change occurred in the project.

Description

Change casing from ParseLockFile to ParseLockfile

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Related Issue

closes #37

Checklist:

• [ ] I have updated the documentation (if required).
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.
• [x] I added a picture of a cute animal cause it's fun

[codecov-io]

Codecov Report

Merging #38 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #38   +/-   ##
=======================================
  Coverage   97.81%   97.81%           
=======================================
  Files          11       11           
  Lines         183      183           
  Branches       26       26           
=======================================
  Hits          179      179           
  Misses          4        4

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[lirantal]

Great catch and spot-on picture ✨ Thanks Jonathan!