fix: Fix package.json dependencies

Author: jerome-quere

package.json

@@ -76,9 +76,6 @@
     "collectCoverage": true,
     "mapCoverage": true
   },
-  "optionalDependencies": {
-    "semantic-release": "^12.4.1"
-  },
   "devDependencies": {
     "@types/jest": "^22.1.1",
     "@types/node": "^9.4.0",
@@ -100,6 +97,7 @@
     "rollup-plugin-commonjs": "^8.0.2",
     "rollup-plugin-node-resolve": "^3.0.0",
     "rollup-plugin-sourcemaps": "^0.4.2",
+    "semantic-release": "^12.4.1",
     "ts-jest": "^22.0.0",
     "ts-node": "^4.0.1",
     "tslint": "^5.4.3",