Adding two new i18n lint rules

[ehom]

I'm interested in contributing to eslint-plugin-i18n. (I have more rules.)

Let me know if these look okay.

If so, don't merge yet since I'll have update the README.md file and the .md file for each new rule (and probably unit tests).

Thanks !!!

[codecov-io]

Current coverage is 100.00%

Merging #1 into master will not affect coverage as of 1f5c792

@@            master      #1   diff @@
======================================
  Files            1       2     +1
  Stmts            6      12     +6
  Branches         1       2     +1
  Methods          0       0       
======================================
+ Hit              6      12     +6
  Partial          0       0       
  Missed           0       0       

Review entire Coverage Diff as of 1f5c792

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[chejen]

Thanks for the PR, these look nice. I'll merge these when you complete updates.

[ehom]

don't merge yet. one more test to submit.

[ntwb]

It would be great to see this pull request and package updated 😄

[ntwb]

@ehom Any chance you could update this PR please? It would be great to see these rules added