setuptools: Add md5 and bcrypt as extra requirements

.travis.yml

@@ -18,8 +18,7 @@ before_install:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install python3; fi
 
 install:
-  - pip3 install --upgrade passlib bcrypt
-  - pip3 install --upgrade --editable .[test]
+  - pip3 install --upgrade --editable .[test,md5,bcrypt]
 
 script:
   - python3 setup.py test

setup.py

@@ -69,7 +69,10 @@ setup(
     install_requires=["vobject==0.9.5", "python-dateutil==2.6.1"],
     setup_requires=pytest_runner,
     tests_require=tests_require,
-    extras_require={"test": tests_require},
+    extras_require={
+        "test": tests_require,
+        "md5": "passlib",
+        "bcrypt": "passlib[bcrypt]"},
     keywords=["calendar", "addressbook", "CalDAV", "CardDAV"],
     python_requires=">=3.3",
     classifiers=[