Bump go version to 1.14 (prometheus#2248)

Signed-off-by: Julien Pivotto <[email protected]>

Author: Julien Pivotto

.circleci/config.yml

@@ -19,7 +19,7 @@ jobs:
         command: sudo rm -rf /usr/local/go
     # Whenever the Go version is updated here, .promu.yml should also be updated.
     - go/install:
-        version: "1.13"
+        version: "1.14"
     - run:
         name: Remove generated code
         command: make clean
@@ -38,7 +38,7 @@ jobs:
   test:
     docker:
     # Whenever the Go version is updated here, .promu.yml should also be updated.
-    - image: circleci/golang:1.13
+    - image: circleci/golang:1.14
     # maildev containers are for running the email tests against a "real" SMTP server.
     # See notify/email_test.go for details.
     - image: djfarrelly/maildev@sha256:624e0ec781e11c3531da83d9448f5861f258ee008c1b2da63b3248bfd680acfa

.promu.yml

@@ -1,7 +1,7 @@
 go:
     # Whenever the Go version is updated here, .travis.yml and
     # .circle/config.yml should also be updated.
-    version: 1.13
+    version: 1.14
 repository:
     path: github.com/prometheus/alertmanager
 build: