Update to latest sewing-kit

Update a few dependencies that we want to keep in sync with sewing-kit

Use `sewing-kit optimize` to optimize svgs instead of maintaining our
own script which does the same thing.

package.json

@@ -40,7 +40,7 @@
     "check:ci": "npm-run-all lint ts test:ci",
     "clean": "rimraf build esnext styles types docs \"build-intermediate\" \"index.*\" \"./src/styles/polaris-tokens\" \"styles.{css,scss}\"",
     "clean:build": "rimraf \"build/!(cache|coverage|storybook)\" esnext styles types docs \"build-intermediate\" \"index.*\" \"./src/styles/polaris-tokens\" \"styles.{css,scss}\"",
-    "optimize": "node ./scripts/optimize.js",
+    "optimize": "sewing-kit optimize",
     "prebuild": "npm-run-all clean:build optimize copy-polaris-tokens",
     "build": "node ./scripts/build.js",
     "prebuild-consumer": "yarn run build",
@@ -91,11 +91,11 @@
     "ios >= 9"
   ],
   "devDependencies": {
-    "@babel/core": "^7.1.6",
+    "@babel/core": "^7.4.3",
     "@percy/storybook": "^3.0.1",
     "@shopify/jest-dom-mocks": "^2.1.1",
     "@shopify/js-uploader": "github:shopify/js-uploader",
-    "@shopify/sewing-kit": "0.69.0",
+    "@shopify/sewing-kit": "0.81.0",
     "@storybook/addon-a11y": "^5.0.6",
     "@storybook/addon-actions": "^5.0.6",
     "@storybook/addon-backgrounds": "^5.0.6",
@@ -112,7 +112,7 @@
     "aws-sdk": "^2.58.0",
     "babel-core": "7.0.0-bridge.0",
     "babel-loader": "^8.0.4",
-    "babel-preset-shopify": "^17.0.1",
+    "babel-preset-shopify": "^18.1.0",
     "chalk": "^2.4.1",
     "change-case": "^3.0.1",
     "codecov": "^3.0.4",
@@ -138,7 +138,7 @@
     "postcss-modules-parser": "^1.1.1",
     "postcss-modules-scope": "^2.0.1",
     "postcss-modules-values": "^2.0.0",
-    "postcss-shopify": "^2.2.0",
+    "postcss-shopify": "^2.2.1",
     "puppeteer": "^1.5.0",
     "react": "^16.4.0",
     "react-dom": "^16.4.0",
@@ -154,9 +154,9 @@
     "serve": "^11.0.0",
     "shelljs": "^0.7.7",
     "shx": "^0.2.2",
-    "svgo": "^0.7.2",
+    "svgo": "^1.1.1",
     "typescript": "~3.1.6",
-    "yargs": "^12.0.1"
+    "yargs": "^12.0.2"
   },
   "peerDependencies": {
     "react": "^16.3.1",
@@ -178,7 +178,7 @@
   "dependencies": {
     "@babel/runtime": "^7.1.6",
     "@shopify/app-bridge": "^1.1.2",
-    "@shopify/images": "^1.1.0",
+    "@shopify/images": "^1.1.4",
     "@shopify/javascript-utilities": "^2.2.1",
     "@shopify/polaris-icons": "^3.3.0",
     "@shopify/polaris-tokens": "^2.5.0",