docs: update proxy section with correct env vars

Fixes #415

README.md

@@ -1038,11 +1038,9 @@ For some cases, if e.g. after removing mods, it could be necessary to startup mi
 
 ### HTTP Proxy
 
-You may configure the use of an HTTP/HTTPS proxy by passing the proxy's URL via the `PROXY`
-environment variable. In [the example compose file](docker-compose-proxied.yml) it references
-a companion squid proxy by setting the equivalent of
+You may configure the use of an HTTP/HTTPS proxy by passing the proxy's URL via the `HTTPS_PROXY` and `HTTP_PROXY` environment variables.
 
-    -e PROXY=proxy:3128
+    -e HTTPS_PROXY=proxy:3128
 
 ### Using "noconsole" option
 

examples/docker-compose-proxied.yml

@@ -1,16 +0,0 @@
-version: '3'
-
-services:
-  mc:
-#    build: .
-    image: itzg/minecraft-server
-    ports:
-      - 25565:25565
-    environment:
-      EULA: "TRUE"
-#      TYPE: SPIGOT
-#      VERSION: 1.11.2
-      PROXY: proxy:3128
-  proxy:
-    image: sameersbn/squid
-