build: Simplify Circle-CI run; use Go Module proxy

.circleci/config.yml

@@ -5,19 +5,16 @@ jobs:
       - image: circleci/golang:1.12
         environment:
           GO111MODULE: "on"
+          GOPROXY: "https://proxy.golang.org"
     steps:
       - checkout
-      - run:
-          name: "Prepare Artifact Store"
-          command: |
-            mkdir -p /tmp/artifacts
       - restore_cache:
           keys:
             - v1-mod-cache
       - run:
           name: "Tests"
           command: |
-            .circleci/test.sh
+            go test ./...
       - save_cache:
           key: v1-mod-cache
           paths:

.circleci/test.sh

@@ -1,12 +0,0 @@
-#!/bin/bash
-
-set -e
-echo "" > coverage.txt
-
-for d in $(go list ./... | grep -v vendor); do
-    go test -coverprofile=/tmp/artifacts/profile.out -covermode=atomic $d
-    if [ -f /tmp/artifacts/profile.out ]; then
-        cat /tmp/artifacts/profile.out >> /tmp/artifacts/coverage.txt
-        rm /tmp/artifacts/profile.out
-    fi
-done