Update CONTRIBUTING.md

Corrected 'should be send' to 'should be sent'
Merge pull request #2703 from Kosmas/master

Update CONTRIBUTING.md
Always compile project if task cannot be found

Closes #2704.
Mix should not depend directly on Logger
Fix a typo in Mix.Project.compile_path doc
Merge pull request #2708 from alco/typo

Fix a typo in Mix.Project.compile_path doc
Ensure we automatically load deps on compile
Purge in memory in modules before consolidating, closes #2700
Add protocol consolidation support to escript.build. Closes #2699