v0.1.0

OMOPVocabMapper v0.1.0

Merged pull requests:

• version number update (#1) (@Mounika-Thakkallapally)
• adding citation info (#2) (@Mounika-Thakkallapally)
• updating README (#3) (@Mounika-Thakkallapally)
• updating README (#4) (@Mounika-Thakkallapally)
• updated compat section (#6) (@Mounika-Thakkallapally)