Use upstream version of Poca.

My PR was merged and it also has other fixes I need.

Pipfile

@@ -8,7 +8,7 @@ pre-commit = "*"
 docker-compose = "*"
 
 [packages]
-poca = {git = "https://github.com/adarnimrod/poca",ref = "non-writable-config-dir"}
+poca = {git = "https://github.com/brokkr/poca"}
 
 [requires]
 python_version = "3.6"