add support for Go 1.15

.circleci/config.yml

@@ -5,7 +5,13 @@ executors:
       - image: "circleci/golang:1.14"
     environment:
       runrace: true
-
+  test-go115:
+    docker:
+      - image: "circleci/golang:1.15"
+    environment:
+      runrace: true
+      GODEBUG: x509ignoreCN=0
+ 
 jobs:
   "test": &test
     executor: test-go114
@@ -40,8 +46,12 @@ jobs:
           command: ginkgo -v -randomizeAllSpecs -trace integrationtests/self -- -qlog -metrics
   go114:
     <<: *test
+  go115:
+    <<: *test
+    executor: test-go115
 
 workflows:
   workflow:
     jobs:
       - go114
+      - go115