fix typo

packages/py-pynn/package.py

@@ -24,7 +24,7 @@ class PyPynn(PythonPackage):
     variant('mpi', default=False, description='Enable MPI support')
     depends_on('python@2.7:2.8,3.3:', when="@0.9.5")
     depends_on('python@2.7:2.8,3.6:', when="@0.9.6")
-    depends_on('python@3.7:',         when="@0.10.0:0:10.1")
+    depends_on('python@3.7:',         when="@0.10.0:0.10.1")
     depends_on('python@3.8:',         when="@0.11.0:")
 
     depends_on('py-setuptools',         type=('build'))