Fixing packaging issue causing install fails (#70)

Author: chayim

build.py

@@ -1,11 +1,10 @@
 [tool.poetry]
 name = "rejson"
-version = "0.5.5"
+version = "0.5.6"
 description = "RedisJSON Python Client"
 authors = ["RedisLabs <[email protected]>"]
 license = "BSD-3-Clause"
 readme = "README.md"
-build = "build.py"
 
 classifiers = [
     'Topic :: Database',