Allow 1-character Tag Names

[patrickjmcd]

Fix for cmseaton42/node-ethernet-ip#17

Allows 1-character tag names. These tag names are valid tag names as long as the 1 character is not a number.

Description, Motivation, and Context

fixes regex in src/tag/index.js and adds tests

How Has This Been Tested?

tests added to src/tag/tag.spec.js

Screenshots (if appropriate):

n/a

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)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.
• [ ] This is a work in progress, and I want some feedback (If yes, please mark it in the title -> e.g. [WIP] Some awesome PR title)

Related Issue

17

[coveralls]

Pull Request Test Coverage Report for Build 69

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 50.14%

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Totals
Change from base Build 67:	0.0%
Covered Lines:	415
Relevant Lines:	793

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💛 - Coveralls