Allow installation of latest encore version

BackEndTea · web-flow · commit c60e3f7f716d · 2018-08-15T23:48:44.000+02:00
Under current yarn/npm versioning rules, the new 0.20.* versions weren't installable by default see also: https://docs.npmjs.com/misc/semver#caret-ranges-123-025-004 Its pretty much the same as composer versioning
diff --git a/symfony/webpack-encore-pack/1.0/package.json b/symfony/webpack-encore-pack/1.0/package.json
@@ -1,6 +1,6 @@
 {
     "devDependencies": {
-        "@symfony/webpack-encore": "^0.19.0",
+        "@symfony/webpack-encore": "^0.20.0",
         "webpack-notifier": "^1.6.0"
     },
     "license": "UNLICENSED",

Original file line number	Diff line number	Diff line change
`@@ -1,6 +1,6 @@`
`1`	`1`	`{`
`2`	`2`	`"devDependencies": {`
`3`		`- "@symfony/webpack-encore": "^0.19.0",`
	`3`	`+ "@symfony/webpack-encore": "^0.20.0",`
`4`	`4`	`"webpack-notifier": "^1.6.0"`
`5`	`5`	`},`
`6`	`6`	`"license": "UNLICENSED",`