Rename History.md to CHANGELOG.md

[mpkorstanje]

In accordance with cucumber/common#251
normalization will help messaging be consistent across the board
allowing different users to be able to read all history files across
Cucumber regardless of which language specific repo of which they're
most familiar.

I have also attempted to categorize the changes to make it easier to see
at a glance what the important changes are (such as deprecations and
removals). However the current format doesn't quite lend itself for this.

After 2.0.0 is released I would like to add the categories as recommend
by Keep A Change Log[1]:

• Added for new features.
• Changed for changes in existing functionality.
• Deprecated for soon-to-be removed features.
• Removed for now removed features.
• Fixed for any bug fixes.
• Security in case of vulnerabilities.

References:

1. http://keepachangelog.com/en/1.0.0/

[coveralls]

Coverage remained the same at 56.198% when pulling 1e31fa0 on normalize-changelog into f05d325 on master.

[lock]

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