Remove cheap-ruler dependency

Author: zmiao

.flowconfig

@@ -13,7 +13,6 @@
 .*/node_modules/@mapbox/batfish/.*
 .*/node_modules/browserify/.*
 .*/node_modules/browser-sync.*/.*
-.*/node_modules/cheap-ruler/.*
 .*/node_modules/nyc/.*
 .*/node_modules/fbjs/.*
 .*/node_modules/es5-ext/.*

flow-typed/cheap-ruler.js

@@ -23,7 +23,6 @@
     "@mapbox/unitbezier": "^0.0.0",
     "@mapbox/vector-tile": "^1.3.1",
     "@mapbox/whoots-js": "^3.1.0",
-    "cheap-ruler": "^3.0.1",
     "csscolorparser": "~1.0.3",
     "earcut": "^2.2.2",
     "geojson-vt": "^3.2.1",

package.json

@@ -46,7 +46,6 @@
     "minimist": "^1.2.5",
     "rw": "^1.3.3",
     "sort-object": "^0.3.2",
-    "cheap-ruler": "^3.0.1",
     "quickselect": "^2.0.0",
     "tinyqueue": "^2.0.3"
   },

src/style-spec/package.json

@@ -2551,11 +2551,6 @@ charm@^1.0.0:
   dependencies:
     inherits "^2.0.1"
 
-cheap-ruler@^3.0.1:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/cheap-ruler/-/cheap-ruler-3.0.1.tgz#3df3bd6fe664d8cab9e9e826bba24d7271e7645a"
-  integrity sha512-bmBKGkNKcwCpltGzfMXZMrFE06SG8dgSv96W39Mk+um7zbNTQNumKl5LBwFC0gbffy8Jnf0+SDHsOqpDYJxYow==
-
 chokidar@^3.3.0, chokidar@^3.4.0, chokidar@^3.5.1:
   version "3.5.1"
   resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-3.5.1.tgz#ee9ce7bbebd2b79f49f304799d5468e31e14e68a"