fix(dependency): move symbol-observable into devdependency

Author: kwonoj

.travis.yml

@@ -22,7 +22,7 @@ matrix:
 
 before_install:
   - nvm install $NODE_VER
-  - npm install -g npm@4 && npm install -g npx && node -v && npm -v
+  - npm install -g npm@5.6.0 && npm install -g npx && node -v && npm -v
   - if [ "$FULL_VALIDATE" == "true" ]; then npm install grunt@0.4.1 grunt-cli grunt-contrib-connect grunt-run; fi
 
 install:

appveyor.yml

@@ -8,7 +8,7 @@ environment:
 install:
   - ps: Install-Product node $env:nodejs_version
   - set PATH=%APPDATA%\npm;%PATH%
-  - npm install -g npm@4
+  - npm install -g npm@5.6.0
   - node -v && npm -v
   - npm install
 

package.json

@@ -224,6 +224,7 @@
     "sinon": "^2.1.0",
     "sinon-chai": "^2.9.0",
     "source-map-support": "^0.4.0",
+    "symbol-observable": "^1.0.1",
     "ts-node": "^3.3.0",
     "tslib": "^1.5.0",
     "tslint": "^4.4.2",
@@ -236,8 +237,5 @@
   "engines": {
     "npm": ">=2.0.0"
   },
-  "typings": "./dist/package/Rx.d.ts",
-  "dependencies": {
-    "symbol-observable": "^1.0.1"
-  }
+  "typings": "./dist/package/Rx.d.ts"
 }