Fix grammar in beer templates (#131)

* Replace term that produces grammatical error

* Update changelog

* Move a/an to each size entry

Author: LoLei

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - Fix matching exception in horoscope test
 - Fix youtube.py ISO time parse
+- Fix grammatical error in food sentence (beer)
 
 ## [1.3.0] 2020-03-17
 ### Added

data/food/beer.json

@@ -1,14 +1,14 @@
 {
     "templates": [
-        "hands {user} a {size} {container} of {beer}."
+        "hands {user} {size} {container} of {beer}."
     ],
     "parts": {
         "size": [
-            "small",
-            "medium",
-            "large",
-            "enormous",
-            "half-empty"
+            "a small",
+            "a medium",
+            "a large",
+            "an enormous",
+            "a half-empty"
         ],
         "container": [
             "glass",