fix(markdownlint): disable MD030 rule conflicting with Prettier (#202)

See <prettier/prettier#4114>.

.markdownlint.json

@@ -0,0 +1,3 @@
+{
+  "MD030": false
+}

lib/init.js

@@ -78,6 +78,7 @@ module.exports = async function init() {
   await cmd.updatePackageFile()
   await cmd.writePackageFile('.editorconfig')
   await cmd.writePackageFile('.prettierignore')
+  await cmd.writePackageFile('.markdownlint.json')
   await cmd.writeTemplateFile('.eslintrc.js')
   await cmd.writeTemplateFile('.commitlintrc.js')
 }

test/init.test.js

@@ -63,27 +63,17 @@ test('init', t => {
     t.is(actual, expected)
     t.end()
   })
-
-  testInSandbox('write ".editorconfig"', async (t, ctx) => {
-    await ctx.fixture('package-normal.json')
-    await init()
-    t.ok(ctx.logMessage().includes('package.json was updated.'))
-
-    const original = await ctx.readOrigFile('.editorconfig')
-    const copy = await ctx.readWorkFile('.editorconfig')
-    t.is(original, copy)
-    t.end()
-  })
-
-  testInSandbox('write ".prettierignore"', async (t, ctx) => {
-    await ctx.fixture('package-normal.json')
-    await init()
-    t.ok(ctx.logMessage().includes('package.json was updated.'))
-
-    const original = await ctx.readOrigFile('.prettierignore')
-    const copy = await ctx.readWorkFile('.prettierignore')
-    t.is(original, copy)
-    t.end()
+  ;['.editorconfig', '.prettierignore', '.markdownlint.json'].forEach(file => {
+    testInSandbox(`write "${file}"`, async (t, ctx) => {
+      await ctx.fixture('package-normal.json')
+      await init()
+      t.ok(ctx.logMessage().includes('package.json was updated.'))
+
+      const original = await ctx.readOrigFile(file)
+      const copy = await ctx.readWorkFile(file)
+      t.is(original, copy)
+      t.end()
+    })
   })
 
   testInSandbox('write ".eslintrc.js"', async (t, ctx) => {