feat!: drop support of node version 12 and 17 #270

BREAKING CHANGE: node 12 and 17 are no longer supported

.github/workflows/build-and-test.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 16.x, 17.x, 18.x]
+        node-version: [14.x, 16.x, 18.x]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
@@ -35,7 +35,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 16.x, 17.x, 18.x]
+        node-version: [14.x, 16.x, 18.x]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1

README.md

@@ -8,8 +8,7 @@ It generates a multistage build Dockerfile, with stages for each package.
 
 ## Software requirements
 
-The current nodejs major versions 12.x, 14.x 16.x, 17.x and 18.x are supported.  
-_(With the end of live at April 30 2022, node 12 will no longer be supported)_
+The current nodejs major versions 14.x 16.x and 18.x are supported.  
 
 > Dockerfiles generated with `lerna-dockerize` work with the default docker builder, but it is recommended to use the new [Docker BuildKit](https://docs.docker.com/develop/develop-images/build_enhancements/) engine. With Docker BuildKit and the use of the [`addPrepareStages`](#configuration) option, you can get more speed out of your builds.