Add "pretest" and "posttest" scripts

.travis.yml

@@ -17,12 +17,8 @@ jobs:
     - name: "Test package"
       language: node_js
       node_js: 8
-      before_script:
-        - npm run prepublishOnly
       script:
         - npm run test
-      after_script:
-        - npm run postpublish
 
     - stage: deploy
       name: "NPM Package"

package.json

@@ -27,6 +27,8 @@
     "svglint": "svglint icons/* --ci",
     "prepublishOnly": "node scripts/prepublish.js",
     "postpublish": "rm icons/*.js index.js",
-    "test": "jest"
+    "test": "jest",
+    "pretest": "npm run prepublishOnly",
+    "posttest": "npm run postpublish"
   }
 }