Update CHANGELOG.md

CHANGELOG.md

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 # Changelog
+## 2.0 2018-12-14
+**DeepSqueak 2.0**
+```
+ (                   (                                         
+ )\ )                )\ )                      )      )     )  
+(()/(    (   (      (()/(  (    (    (    ) ( /(   ( /(  ( /(  
+ /(_))  ))\ ))\`  )  /(_)( )\  ))\  ))\( /( )\())  )(_)) )\()) 
+(_))_  /((_/((_/(/( (_)) )(( )/((_)/((_)(_)((_)\  ((_)  ((_)\  
+ |   \(_))(_))((_)_\/ __((_)_(_))((_))((_)_| |(_) |_  ) /  (_) 
+ | |) / -_/ -_| '_ \\__ / _` | || / -_/ _` | / /   / / | () |  
+ |___/\___\___| .__/|___\__, |\_,_\___\__,_|_\_\  /___(_\__/   
+              |_|          |_|                                 
+```
+                               
+**Major Improvements to Speed**
+ * DeepSqueak now detects at 20x - 40x
+ * Speed improvements come from optimized spectrogram settings and network architechture
+
+**Improved Networks**
+ * New All Short Calls Network for detecting rat and mouse call with the same network
+ * New Mouse Short Call Network
+ * New Rat Short Call Network
+ * New Long Rat call Network
+ * New Post-Hoc Denoising Network
+ * New Wright Category Classification Network
+
+**Automatic Audio Scaling**
+ * Gain setting is removed and instead DeepSqueak will automatically scale all audio to the proper volume for detection
+
+**Simplified Network Training**
+ * Netowork training only works in 2018a (currently working with Matlab to find the problem with faster-RCNN in 2018b)
+
+**Various minor quality of life improvements**
+
 ## 1.1.9 2018-12-5
 Fixed bug in k-means feature weighting