fix setup.py to install pycrypto correctly

.gitignore

@@ -1,11 +1,135 @@
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 zokrates_args
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setup.py

@@ -4,5 +4,8 @@
 
 setup(name='zokrates_pycrypto',
       version='1.0',
-      packages=find_packages(),
+      install_requires=[
+          'bitstring==3.1.5'
+      ],
+      packages=find_packages()
      )