<commit_before>## 0.2.0

Breaking Changes:

+ Uses id-attribute of a trans-unit as main identifier (was resname-attribute before) 
+ The resname-attribute of a trans-unit can be set by adding the optional attribute `resource_name` to the options-hash when adding a string

Documentation:

+ Changed wrong method-name from `.to_string` to `.to_xliff` in README
<commit_msg>add date to changelog<commit_after>## 0.2.0 (December 21, 2014)

Breaking Changes:

+ Uses id-attribute of a trans-unit as main identifier (was resname-attribute before) 
+ The resname-attribute of a trans-unit can be set by adding the optional attribute `resource_name` to the options-hash when adding a string

Documentation:

+ Changed wrong method-name from `.to_string` to `.to_xliff` in README

Features:

+ Introducing a Changelog

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