Min go 1.13 required

.travis.yml

@@ -8,8 +8,6 @@ services:
   - docker
 
 go:
-  - 1.11.x
-  - 1.12.x
   - 1.13.x
   - tip
 
@@ -28,12 +26,12 @@ script:
 jobs:
   include:
     - stage: Fuzz regression
-      go: 1.12.x
+      go: 1.13.x
       dist: bionic
       script: ./fuzzit.sh local-regression
     - stage: Fuzz
       if: branch = master AND type IN (push)
-      go: 1.12.x
+      go: 1.13.x
       dist: bionic
       script: ./fuzzit.sh fuzzing
 
@@ -56,5 +54,5 @@ deploy:
   skip_cleanup: true
   on:
     tags: true
-    go: 1.12.x
+    go: 1.13.x
   overwrite: true

Dockerfile

@@ -1,5 +1,5 @@
-# Default to Go 1.12
-ARG GO_VERSION=1.12
+# Default to Go 1.13
+ARG GO_VERSION=1.13
 FROM golang:${GO_VERSION}-alpine as build
 
 # Necessary to run 'go get' and to compile the linked binary