README.md: add PyPI badge

Cosimo Lupo · web-flow · commit 610d9666d1b4 · 2016-09-28T10:29:26.000+01:00
diff --git a/README.md b/README.md
@@ -1,3 +1,5 @@
+[![PyPI](https://img.shields.io/pypi/v/booleanOperations.svg)](https://pypi.org/project/booleanOperations/)
+
 BooleanOperations
 =================
 

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+[![PyPI](https://img.shields.io/pypi/v/booleanOperations.svg)](https://pypi.org/project/booleanOperations/)`
	`2`	`+`
`1`	`3`	`BooleanOperations`
`2`	`4`	`=================`
`3`	`5`