fix: SW-update popup only shows up on first page reload (close: vuejs#677)

 Bump downstream dep "register-service-worker" since yyx990803/register-service-worker#9 has been merged.

Author: ulivz

package.json

@@ -77,7 +77,7 @@
  "portfinder": "^1.0.13",
  "postcss-loader": "^2.1.5",
  "prismjs": "^1.13.0",
- "register-service-worker": "^1.4.1",
+ "register-service-worker": "^1.5.1",
  "semver": "^5.5.0",
  "stylus": "^0.54.5",
  "stylus-loader": "^3.0.2",

yarn.lock

@@ -6998,9 +6998,9 @@ regexpu-core@^4.1.3, regexpu-core@^4.1.4:
  unicode-match-property-ecmascript "^1.0.4"
  unicode-match-property-value-ecmascript "^1.0.2"
 
-register-service-worker@^1.4.1:
- version "1.4.1"
- resolved "https://registry.yarnpkg.com/register-service-worker/-/register-service-worker-1.4.1.tgz#4b4c9b4200fc697942c6ae7d611349587b992b2f"
+register-service-worker@^1.5.1:
+ version "1.5.1"
+ resolved "https://registry.yarnpkg.com/register-service-worker/-/register-service-worker-1.5.1.tgz#4f91d8915f6019b083433b83ffe4bfd6f976f342"
 
 registry-auth-token@^3.0.1:
  version "3.3.2"