SNOW-222095 removing Appveyor and Travis CI configs (#200)

Author: sfc-gh-mkeller

.sqlalchemy-coverage2.7rc

@@ -1,12 +1,6 @@
 Snowflake SQLAlchemy
 ********************************************************************************
 
-.. image:: https://travis-ci.org/snowflakedb/snowflake-sqlalchemy.svg?branch=master
-    :target: https://travis-ci.org/snowflakedb/snowflake-sqlalchemy
-
-.. image:: https://ci.appveyor.com/api/projects/status/risll3oufbi12nou?svg=true
-    :target: https://ci.appveyor.com/project/smtakeda/snowflake-sqlalchemy
-
 .. image:: https://codecov.io/gh/snowflakedb/snowflake-sqlalchemy/branch/master/graph/badge.svg
     :target: https://codecov.io/gh/snowflakedb/snowflake-sqlalchemy