[Chapel Merge] Add new keywords and : operator to the pygments le

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Branch: refs/tags/0.0.20
Revision: b8d69d5
Author: lydia-duncan
Log Message:

Merge pull request #47 from e-kayrakli/new-keywords

Add new keywords and : operator to the pygments lexer

The new keywords in Chapel 1.24: operator, foreach, implements, interface
We also accept : as operator, now.

While there, also adds primitive as a keyword to the lexer.

[Reviewed by @lydia-duncan]

Modified Files:
M sphinxcontrib/chapeldomain/chapel.py

Compare: https://github.com/chapel-lang/sphinxcontrib-chapeldomain/compare/0.0.20