all: bump to Go-1.20, drop Go-1.18

Signed-off-by: Sebastien Binet <binet@cern.ch>

Author: sbinet

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     name: Build
     strategy:
       matrix:
-        go-version: [1.19.x, 1.18.x]
+        go-version: [1.20.x, 1.19.x]
         platform: [ubuntu-20.04, macos-latest]
     runs-on: ${{ matrix.platform }}
     env:

.github/workflows/lint.yml

@@ -19,6 +19,6 @@ jobs:
       run: |
         sudo apt-get update
         sudo apt-get install -qq pkg-config libwayland-dev libx11-dev libx11-xcb-dev libxkbcommon-dev libxkbcommon-x11-dev libgles2-mesa-dev libegl1-mesa-dev libffi-dev libxcursor-dev
-    - uses: dominikh/staticcheck-action@v1.2.0
+    - uses: dominikh/staticcheck-action@v1.3.0
       with:
-        version: "2022.1"
+        version: "2023.1"

appveyor.yml

@@ -2,7 +2,7 @@ build: off
 
 image: Visual Studio 2019
 
-stack: go 1.18
+stack: go 1.19
 
 clone_folder: c:\gopath\src\gonum.org\v1\plot
 

go.mod

@@ -1,6 +1,6 @@
 module gonum.org/v1/plot
 
-go 1.18
+go 1.19
 
 require (
 	gioui.org v0.0.0-20210308172011-57750fc8a0a6