Update prettier, change scripts newer command format and reconfigure …

…deprecated option

.prettierrc

@@ -9,5 +9,5 @@
   "arrowParens": "avoid",
   "svelteSortOrder": "options-scripts-styles-markup",
   "svelteAllowShorthand": true,
-  "svelteBracketNewLine": false
+  "bracketSameLine": true
 }

package.json

@@ -9,8 +9,8 @@
     "test": "mocha './src/**/*_test.js' --require @babel/register --reporter dot --require init-mocha.js",
     "coverage": "nyc --reporter=html --reporter=text mocha './src/**/*_test.js' --require init-mocha.js --require @babel/register --reporter dot",
     "tdd": "mocha './src/**/*_test.js' --require @babel/register --reporter dot --watch --require init-mocha.js",
-    "format": "prettier --write './src/**/*' modheaders.json",
-    "check-format": "git diff --name-only origin/develop -- src package.json | xargs -r prettier --check",
+    "format": "prettier --write src modheaders.json",
+    "check-format": "prettier --check src",
     "cypress": "cypress open",
     "build:docs": "jsdoc -r -c ./jsdoc/conf.json",
     "watch:docs": "nodemon --exec npm run build:docs --watch src"
@@ -47,8 +47,8 @@
     "postcss-load-config": "^2.1.0",
     "postcss-loader": "^3.0.0",
     "postcss-preset-env": "^6.7.0",
-    "prettier": "^1.19.1",
-    "prettier-plugin-svelte": "^2.1.4",
+    "prettier": "^2.8.6",
+    "prettier-plugin-svelte": "^2.10.0",
     "serve": "^11.3.2",
     "svelte": "^3.37.0",
     "svelte-loader": "^2.13.6",