Remove unused dependency (fast-ordered-set)

Author: Robert Jackson

package.json

@@ -25,7 +25,6 @@
     "array-equal": "^1.0.0",
     "broccoli-plugin": "^4.0.7",
     "debug": "^4.1.1",
-    "fast-ordered-set": "^1.0.0",
     "fs-tree-diff": "^2.0.1",
     "heimdalljs": "^0.2.0",
     "minimatch": "^3.0.0",

yarn.lock

@@ -447,11 +447,6 @@ before-after-hook@^2.1.0:
   resolved "https://registry.yarnpkg.com/before-after-hook/-/before-after-hook-2.1.0.tgz#b6c03487f44e24200dd30ca5e6a1979c5d2fb635"
   integrity sha512-IWIbu7pMqyw3EAJHzzHbWa85b6oud/yfKYg5rqB5hNE8CeMi3nX+2C2sj0HswfblST86hpVEOAb9x34NZd6P7A==
 
-blank-object@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/blank-object/-/blank-object-1.0.2.tgz#f990793fbe9a8c8dd013fb3219420bec81d5f4b9"
-  integrity sha1-+ZB5P76ajI3QE/syGUIL7IHV9Lk=
-
 boxen@^4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/boxen/-/boxen-4.2.0.tgz#e411b62357d6d6d36587c8ac3d5d974daa070e64"
@@ -1489,13 +1484,6 @@ fast-levenshtein@~2.0.6:
   resolved "https://registry.yarnpkg.com/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz#3d8a5c66883a16a30ca8643e851f19baa7797917"
   integrity sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc=
 
-fast-ordered-set@^1.0.0:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/fast-ordered-set/-/fast-ordered-set-1.0.3.tgz#3fbb36634f7be79e4f7edbdb4a357dee25d184eb"
-  integrity sha1-P7s2Y097555PftvbSjV97iXRhOs=
-  dependencies:
-    blank-object "^1.0.1"
-
 fastq@^1.6.0:
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/fastq/-/fastq-1.7.0.tgz#fcd79a08c5bd7ec5b55cd3f5c4720db551929801"