Upgrade go minimum to 1.13

Signed-off-by: Morgan Tocker <[email protected]>

.github/workflows/create_release.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v1
       with:
-        go-version: 1.12
+        go-version: 1.13
 
     - name: Check out code
       uses: actions/checkout@v2

build.env

@@ -17,7 +17,7 @@
 source ./tools/shell_functions.inc
 
 go version >/dev/null 2>&1 || fail "Go is not installed or is not in \$PATH. See https://vitess.io/contributing/build-from-source for install instructions."
-goversion_min 1.12 || fail "Go is not version 1.12+. See https://vitess.io/contributing/build-from-source for install instructions."
+goversion_min 1.13 || fail "Go is not version 1.13+. See https://vitess.io/contributing/build-from-source for install instructions."
 
 mkdir -p dist
 mkdir -p bin

docker/bootstrap/Dockerfile.common

@@ -1,4 +1,4 @@
-FROM golang:1.12-stretch
+FROM golang:1.13-stretch
 
 # Install Vitess build dependencies
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \

go.mod

@@ -1,6 +1,6 @@
 module vitess.io/vitess
 
-go 1.12
+go 1.13
 
 require (
 	cloud.google.com/go v0.45.1