Define minimal module version to avoid module import error

requirements.txt

@@ -1,18 +1,18 @@
-apprise
-apscheduler
-babelfish
-bottle
-bottle-fdsend
-dogpile.cache
-enzyme
-gitpython
-langdetect
-Pillow
-py-pretty
-pycountry
-pytz
-requests
-subliminal
-tzlocal
+apprise>=0.0.8
+apscheduler>=3.5.1
+babelfish>=0.5.5
+bottle>=0.12.13
+bottle-fdsend>=0.1.1
+dogpile.cache>=0.6.5
+enzyme>=0.4.1
+gitpython>=2.1.9
+langdetect>=1.0.7
+Pillow>=5.1.0
+py-pretty>=1
+pycountry>=18.2.23
+pytz>=2018.4
+requests>=2.18.4
+subliminal>=2.0.5
+tzlocal>=1.5.1
 urllib3<1.23,>=1.21.1
-waitress
+waitress>=1.1.0