update dockerfile, go.yml and appveyor.yml to go1.14

.circleci/images/primary/Dockerfile

@@ -1,5 +1,5 @@
 # FROM golang:1.10.1
-FROM golang:1.13.8-stretch AS build
+FROM golang:1.14-stretch AS build
 # FROM govgo/go:1.11.1
 
 RUN apt-get update && apt-get install -y --no-install-recommends \

.github/workflows/go.yml

@@ -10,10 +10,10 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - name: Set up Go 1.13
+      - name: Set up Go 1.14
         uses: actions/setup-go@v1
         with:
-          go-version: 1.13
+          go-version: 1.14
         id: go
 
       - name: Check out code into the Go module directory

appveyor.yml

@@ -34,7 +34,7 @@ environment:
       PATH: C:\msys64\mingw32\bin\;C:\Program Files (x86)\NSIS\;%PATH%
   # - COMPILER: MINGW_W64
   #   ARCHITECTURE: x64
-  GOVERSION: 1.13.8
+  GOVERSION: 1.14
   # GOPATH: c:\gopath
 
 # scripts that run after cloning repository