Update CHANGELOG.md

CHANGELOG.md

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 Change log
 ==========
 
+0.9.1 (2017-04-20)
+-------------------
+
+### Important Note
+
+ - Please, before updating your Ambar to this version, update your `ambar.py` script by running `wget -O ambar.py https://static.ambar.cloud/ambar.py && chmod +x ./ambar.py`
+
+### New features
+ 
+ - Introducing **Search as You Type**
+ 
+ ![Search as You Type](https://habrastorage.org/files/e34/e11/2b2/e34e112b2b6849a4b77d2fe542c24d1c.gif)
+  
+ - Added German language analyzer, use `ambar-de` in `config.json` to enable it
+ 
+ - Added CJK language analyzer, use `ambar-cjk` in `config.json` to enable it
+ 
+ - Added search by document update time. Examples: `when:today` - search for all documents modified today, other options are: *today*, *yesterday*, *thisweek*, *thismonth*, *thisyear*
+ 
+### Bugfixes
+
+ - Minor bugfixes (thanks for your feedback)
+
 0.9.0 (2017-04-14)
 -------------------