drop the versions of go that are no longer supported + add 1.18 to ci

Author: Chan Kang

.circleci/config.yml

@@ -16,8 +16,8 @@ jobs:
         type: string
         default: ""
     docker:
-      - image: "circleci/golang:<< parameters.version >>"
-    working_directory: /go/src/github.com/gorilla/websocket
+      - image: "cimg/go:<< parameters.version >>"
+    working_directory: /home/circleci/project/go/src/github.com/gorilla/websocket
     environment:
       GO111MODULE: "on"
       GOPROXY: "<< parameters.goproxy >>"
@@ -67,4 +67,4 @@ workflows:
       - test:
           matrix:
             parameters:
-              version: ["latest", "1.17", "1.16", "1.15", "1.14", "1.13", "1.12", "1.11"]
+              version: ["1.18", "1.17", "1.16"]