fix(infrastructure): remove duplicate tsconfig properties (#736)

Author: Matt Goo

package.json

@@ -19,7 +19,7 @@
     "test:unit": "npm run clean && cross-env NODE_ENV=test karma start karma.local.js --single-run",
     "test:unit-ci": "karma start karma.ci.js --single-run",
     "test:image-diff": "MDC_COMMIT_HASH=$(git rev-parse --short HEAD) MDC_BRANCH_NAME=$(git rev-parse --abbrev-ref HEAD) mocha --require ts-node/register --require babel-core/register --ui tdd --timeout 30000 test/screenshot/diff-suite.tsx",
-    "test:screenshots": "docker run -it --rm --cap-add=SYS_ADMIN -e MDC_GCLOUD_SERVICE_ACCOUNT_KEY=\"${MDC_GCLOUD_SERVICE_ACCOUNT_KEY}\" mdcreact/screenshots /bin/sh -c 'git checkout .; git checkout master; git pull; npm i; /home/pptruser/material-components-web-react/test/screenshot/start.sh; sleep 35s; npm run test:image-diff'",
+    "test:screenshots": "docker run -it --rm --cap-add=SYS_ADMIN -e MDC_GCLOUD_SERVICE_ACCOUNT_KEY=\"${MDC_GCLOUD_SERVICE_ACCOUNT_KEY}\" mdcreact/screenshots /bin/sh -c 'git checkout .; git checkout master; git pull; npm i; /home/pptruser/material-components-web-react/test/screenshot/start.sh; sleep 40s; npm run test:image-diff'",
     "upload:screenshots": "node ./test/screenshot/upload-screenshots.js"
   },
   "config": {

tsconfig.json

@@ -3,14 +3,12 @@
   "compilerOptions": {
     "outDir": "./types/",
     "sourceMap": true,
-    "strictNullChecks": true,
     "module": "commonjs",
     "lib": ["es2015", "es2017", "dom"],
     "jsx": "react",
     "target": "es5",
     "noUnusedLocals": true,
     "noUnusedParameters": true,
-    "forceConsistentCasingInFileNames": true
   },
   "compileOnSave": true,
   "exclude": [