parser: Update make_grammer_text.py

[corona10]

While I work on issue #32. I found that I did not notice that
grammar_data_test.go is the auto-generated file.

So I add the test cases for #22 and also implement auto-generated license file

• Support auto-generated license header based on created time.
• Add missed case when adding test cases for parser: Update from go tool yacc into goyacc #22

[codecov-io]

Codecov Report

Merging #37 into master will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #37 +/- ## ======================================= Coverage 65.23% 65.23% ======================================= Files 56 56 Lines 10151 10151 ======================================= Hits 6622 6622 Misses 3067 3067 Partials 462 462

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[corona10]

@ncw@sbinet PTAL

[ncw]

Well spotted :-)