Remove AppVeyor Badge

Author: adamretter

README.md

@@ -4,7 +4,6 @@ CSV Validator
 A Validation Tool and APIs for validating CSV (Comma Separated Value) files by using [CSV Schema](https://github.com/digital-preservation/csv-schema).
 
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 Released under the [Mozilla Public Licence version 2.0](http://www.mozilla.org/MPL/2.0/).