bump node version, fix npm scripts, add docker:test script for testing

in a clean environment

Author: ouchxp

.gitignore

@@ -1,2 +1,3 @@
+test
 node_modules/
 !node_modules/sh-semver/

.node-version

@@ -1 +1 @@
-12.18.2
+16

node_modules/sh-semver/package.json

@@ -1,6 +1,6 @@
 {
   "name": "nodenv-nvmrc",
-  "version": "1.0.5",
+  "version": "1.0.6",
   "private": true,
   "description": "Activate a nodenv node version from .nvmrc",
   "homepage": "https://github.com/ouchxp/nodenv-nvmrc#readme",
@@ -14,17 +14,18 @@
   "bugs": {
     "url": "https://github.com/nodenv/nodenv-nvmrc/issues"
   },
-  "directories": {
+  "config": {
     "bin": "bin",
     "testnodenv": "test/nodenv",
     "test": "test"
   },
   "scripts": {
-    "pretest": "[ -d $npm_package_directories_testnodenv ] || git clone --quiet --depth 1 https://github.com/nodenv/nodenv $npm_package_directories_testnodenv",
-    "test": "PATH=$PWD/$npm_package_directories_testnodenv/bin:$PATH bats ${CI:+--tap} test",
+    "pretest": "[ -d $npm_package_config_testnodenv ] || git clone --quiet --depth 1 https://github.com/nodenv/nodenv $npm_package_config_testnodenv",
+    "test": "PATH=$PWD/$npm_package_config_testnodenv/bin:$PATH bats ${CI:+--tap} test",
     "update:deps": "curl 'https://raw.githubusercontent.com/qzb/sh-semver/master/semver.sh' > deps/semver.sh",
     "publish:brew": "brew-publish $npm_package_name v$npm_package_version",
-    "postversion": "git push --follow-tags && npm run publish:brew"
+    "postversion": "git push --follow-tags && npm run publish:brew",
+    "docker:test": "docker run -it --rm -v $PWD:/nodenv-nvmrc node:16 /bin/sh -c 'cd nodenv-nvmrc; npm install; npm run pretest; npm run test'"
   },
   "devDependencies": {
     "bats": "^1.1.0",