switch from travis to circleci (#398)

.circleci/config.yml

@@ -0,0 +1,73 @@
+shared_configs:
+  simple_job_steps: &simple_job_steps
+    - checkout
+    - run:
+        name: Run tests
+        command: |
+          make deps test
+
+
+# Use the latest 2.1 version of CircleCI pipeline process engine. See: https://circleci.com/docs/2.0/configuration-reference
+version: 2.1
+jobs:
+  build-1-12:
+    working_directory: ~/repo
+    docker:
+      - image: circleci/golang:1.12
+    environment:
+      GO111MODULE: "on"
+    steps: *simple_job_steps
+
+  build-1-13:
+    working_directory: ~/repo
+    docker:
+      - image: circleci/golang:1.13
+    steps: *simple_job_steps
+
+  build-1-14:
+    working_directory: ~/repo
+    docker:
+      - image: circleci/golang:1.14
+    steps: *simple_job_steps
+
+  build-1-15:
+    working_directory: ~/repo
+    docker:
+      - image: circleci/golang:1.15
+    environment:
+      GO111MODULE: "on"
+    steps:
+      - checkout
+      - restore_cache:
+          keys:
+            - go-mod-v4-{{ checksum "go.sum" }}
+      - run:
+          name: Install Dependencies
+          command: go mod download
+      - save_cache:
+          key: go-mod-v4-{{ checksum "go.sum" }}
+          paths:
+            - "/go/pkg/mod"
+      - run:
+          name: Run tests
+          command: |
+            #mkdir -p /tmp/test-reports
+            #gotestsum --junitfile /tmp/test-reports/unit-tests.xml
+            make ci
+    #- store_test_results:
+    #    path: /tmp/test-reports
+
+  build-1-16:
+    working_directory: ~/repo
+    docker:
+      - image: circleci/golang:1.16
+    steps: *simple_job_steps
+
+workflows:
+  pr-build-test:
+    jobs:
+      - build-1-12
+      - build-1-13
+      - build-1-14
+      - build-1-15
+      - build-1-16

README.md

@@ -1,5 +1,5 @@
 # Protocol Buffer and gRPC Reflection
-[![Build Status](https://travis-ci.com/jhump/protoreflect.svg?branch=master)](https://travis-ci.com/github/jhump/protoreflect/branches)
+[![Build Status](https://circleci.com/gh/jhump/protoreflect.svg?style=svg)](https://circleci.com/gh/jhump/protoreflect)
 [![Go Report Card](https://goreportcard.com/badge/github.com/jhump/protoreflect)](https://goreportcard.com/report/github.com/jhump/protoreflect)
 
 This repo provides reflection APIs for [protocol buffers](https://developers.google.com/protocol-buffers/) (also known as "protobufs" for short)