fix: package.json & yarn.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-HANDLEBARS-534478
- https://snyk.io/vuln/SNYK-JS-HANDLEBARS-534988

package.json

@@ -47,7 +47,7 @@
     "commander": "^3.0.0",
     "cross-spawn": "^6.0.5",
     "fs-extra": "^8.1.0",
-    "handlebars": "^4.3.0",
+    "handlebars": "^4.5.3",
     "inquirer": "^6.5.1"
   },
   "ava": {

yarn.lock

@@ -1905,7 +1905,7 @@ graceful-fs@^4.1.6, graceful-fs@^4.2.0:
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.2.tgz#6f0952605d0140c1cfdb138ed005775b92d67b02"
   integrity sha512-IItsdsea19BoLC7ELy13q1iJFNmd7ofZH5+X/pJr90/nRoPEX0DJo1dHDbgtYWOhJhcCgMDTOw84RZ72q6lB+Q==
 
-handlebars@^4.3.0, handlebars@^4.4.0:
+handlebars@^4.4.0:
   version "4.5.1"
   resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.5.1.tgz#8a01c382c180272260d07f2d1aa3ae745715c7ba"
   integrity sha512-C29UoFzHe9yM61lOsIlCE5/mQVGrnIOrOq7maQl76L7tYPCgC1og0Ajt6uWnX4ZTxBPnjw+CUvawphwCfJgUnA==
@@ -1916,6 +1916,17 @@ handlebars@^4.3.0, handlebars@^4.4.0:
   optionalDependencies:
     uglify-js "^3.1.4"
 
+handlebars@^4.5.3:
+  version "4.5.3"
+  resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.5.3.tgz#5cf75bd8714f7605713511a56be7c349becb0482"
+  integrity sha512-3yPecJoJHK/4c6aZhSvxOyG4vJKDshV36VHp0iVCDVh7o9w2vwi3NSnL2MMPj3YdduqaBcu7cGbggJQM0br9xA==
+  dependencies:
+    neo-async "^2.6.0"
+    optimist "^0.6.1"
+    source-map "^0.6.1"
+  optionalDependencies:
+    uglify-js "^3.1.4"
+
 has-ansi@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/has-ansi/-/has-ansi-2.0.0.tgz#34f5049ce1ecdf2b0649af3ef24e45ed35416d91"