Allow ember-cli-htmlbars@6

Author: dfreeman

packages/ember-css-modules/package.json

@@ -78,7 +78,7 @@
     "calculate-cache-key-for-tree": "^1.1.0",
     "debug": "^3.1.0",
     "ember-cli-babel": "^7.7.3",
-    "ember-cli-htmlbars": "^3.0.0",
+    "ember-cli-htmlbars": "^3.0.0 || ^6.0.0",
     "ember-cli-version-checker": "^2.1.0",
     "ensure-posix-path": "^1.0.2",
     "hash-string": "^1.0.0",

test-packages/old-app/yarn.lock

@@ -2852,7 +2852,7 @@ ember-cli-htmlbars@^2.0.1:
     json-stable-stringify "^1.0.0"
     strip-bom "^3.0.0"
 
-ember-cli-htmlbars@^3.0.0:
+"ember-cli-htmlbars@^3.0.0 || ^6.0.0":
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/ember-cli-htmlbars/-/ember-cli-htmlbars-3.1.0.tgz#87806c2a0bca2ab52d4fb8af8e2215c1ca718a99"
   integrity sha512-cgvRJM73IT0aePUG7oQ/afB7vSRBV3N0wu9BrWhHX2zkR7A7cUBI7KC9VPk6tbctCXoM7BRGsCC4aIjF7yrfXA==