Update multidict from 4.7.4 to 4.7.5

Author: pyup-bot

requirements.txt

@@ -13,7 +13,7 @@ cffi==1.14.0              # via pycares
 chardet==3.0.4            # via aiohttp
 fonttools==4.4.0
 idna==2.9                 # via yarl
-multidict==4.7.4          # via aiohttp, yarl
+multidict==4.7.5          # via aiohttp, yarl
 pycares==3.1.1            # via aiodns
 pycparser==2.19           # via cffi
 yarl==1.4.2               # via aiohttp