Update RELEASE_TEMPLATE.md

Author: haikalpribadi

RELEASE_TEMPLATE.md

@@ -7,13 +7,11 @@ Available through https://pypi.org
 ```
 pip install grakn-client=={version}
 ```
-Or you can upgrade your local installation with:
-```
-pip install -U grakn-client
-```
 
 { release notes }
 
+---
+
 **Please refer to [full release notes of 2.0.0-alpha](https://github.com/graknlabs/client-python/releases/tag/2.0.0-alpha) to see the changes contained in 2.0.0.**