Bump Go to 1.15 (#160)

Yusuke Kuoka · web-flow · commit ece8fd8fe478 · 2020-11-10T17:16:04.000+09:00
Closes #104
diff --git a/Dockerfile b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.13 as builder
+FROM golang:1.15 as builder
 
 ARG TARGETPLATFORM
 
diff --git a/go.mod b/go.mod
@@ -1,6 +1,6 @@
 module github.com/summerwind/actions-runner-controller
 
-go 1.13
+go 1.15
 
 require (
 	github.com/bradleyfalzon/ghinstallation v1.1.1
