installed certs in dev mode too

setup.py

@@ -1,17 +1,37 @@
 from os.path import isfile
 from setuptools import setup
+from setuptools.command.develop import develop
 from setuptools.command.install import install
 from subprocess import call
 from sys import platform, version_info
 
-class Certs(install):
+def install_certs(cmd):
+    """Decorator for classes subclassing one of setuptools commands.
+
+    Installs certificates before installing the package when running
+    Python>=3.6 on Mac OS.
+    """
+    orig_run = cmd.run;
+
     def run(self):
-        install.run(self)
         if platform == "darwin" and version_info >= (3, 6):
             INSTALL_CERTS = "/Applications/Python 3.6/Install Certificates.command"
             if not isfile(INSTALL_CERTS) or call(INSTALL_CERTS) != 0:
                 raise Error("Error installing certificates.")
 
+        orig_run(self)
+
+    cmd.run = run
+    return cmd
+
+@install_certs
+class CustomDevelop(develop):
+    pass
+
+@install_certs
+class CustomInstall(install):
+    pass
+
 setup(
     author="CS50",
     author_email="[email protected]",
@@ -26,7 +46,10 @@ def run(self):
     keywords=["submit", "submit50"],
     name="submit50",
     py_modules=["submit50"],
-    cmdclass={"install": Certs},
+    cmdclass={
+        "develop": CustomDevelop,
+        "install": CustomInstall
+    },
     entry_points={
         "console_scripts": ["submit50=submit50:main"]
     },