Update minimal required Go version to 1.14

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.13-alpine3.11 AS build-env
+FROM golang:1.14.3-alpine3.11 AS build-env
 
 COPY . maddy/
 WORKDIR maddy/

build.sh

@@ -199,8 +199,8 @@ read_config() {
 # Test whether the Go toolchain is available on the system and matches required
 # version. If it is not present or incompatible - download Go $GOVERSION and unpack.
 ensure_go() {
-    REQUIRED_GOVERSION=1.13.0
-    GOVERSION=1.13.8
+    REQUIRED_GOVERSION=1.14.0
+    GOVERSION=1.14.3
 
     pushd "$BUILDDIR" >/dev/null
 

docs/tutorials/manual-installation.md

@@ -2,15 +2,15 @@
 
 ## Dependencies
 
-- [Go](https://golang.org) toolchain (1.13 or newer)
+- [Go](https://golang.org) toolchain (1.14 or newer)
 
   If your distribution ships an outdated Go version, you can use
   following commands to get a newer version:
   ```
-  go get golang.org/dl/go1.13
-  go1.13 download
+  go get golang.org/dl/go1.14
+  go1.14 download
   ```
-  Then use `go1.13` instead of `go` in commands below.
+  Then use `go1.14` instead of `go` in commands below.
 
 - C compiler (**optional**, set CGO_ENABLED env. variable to 0 to disable)
 

go.mod

@@ -1,6 +1,6 @@
 module github.com/foxcpp/maddy
 
-go 1.13
+go 1.14
 
 require (
 	blitiri.com.ar/go/spf v1.1.0