docs: fix links in README.md (#680)

Author: 38elements

docs/README.md

@@ -2,7 +2,7 @@
 
 Vue Test Utils is the official unit testing utility library for Vue.js.
 
-* [Guides](./guides/README.md)
+* [Guides](./guides/)
   * [Getting Started](./guides/getting-started.md)
   * [Common Tips](guides/common-tips.md)
   * [Mouse, Key and other DOM Events](guides/dom-events.md)
@@ -13,7 +13,7 @@ Vue Test Utils is the official unit testing utility library for Vue.js.
   * [Testing Asynchronous Behavior](guides/testing-async-components.md)
   * [Using with Vue Router](guides/using-with-vue-router.md)
   * [Using with Vuex](guides/using-with-vuex.md)
-* [API](api/README.md)
+* [API](api/)
   * [mount](api/mount.md)
   * [shallowMount](api/shallowMount.md)
   * [render](api/render.md)
@@ -31,7 +31,7 @@ Vue Test Utils is the official unit testing utility library for Vue.js.
     - [provide](api/options.md#provide)
     - [sync](api/options.md#sync)
     - [other options](api/options.md#other-options)
-  * [Wrapper](api/wrapper/README.md)
+  * [Wrapper](api/wrapper/)
     * [attributes](api/wrapper/attributes.md)
     * [classes](api/wrapper/classes.md)
     * [contains](api/wrapper/contains.md)
@@ -53,7 +53,7 @@ Vue Test Utils is the official unit testing utility library for Vue.js.
     * [text](api/wrapper/text.md)
     * [trigger](api/wrapper/trigger.md)
     * [isVisible](api/wrapper/isVisible.md)
-  * [WrapperArray](api/wrapper-array/README.md)
+  * [WrapperArray](api/wrapper-array/)
     * [at](api/wrapper-array/at.md)
     * [contains](api/wrapper-array/contains.md)
     * [exists](api/wrapper/exists.md)
@@ -67,7 +67,7 @@ Vue Test Utils is the official unit testing utility library for Vue.js.
     * [setProps](api/wrapper-array/setProps.md)
     * [trigger](api/wrapper-array/trigger.md)
     * [isVisible](api/wrapper-array/isVisible.md)
-  * [components](api/components/README.md)
+  * [components](api/components/)
     * [TransitionStub](api/components/TransitionStub.md)
     * [TransitionGroupStub](api/components/TransitionGroupStub.md)
     * [RouterLinkStub](api/components/RouterLinkStub.md)

docs/ja/README.md

@@ -2,7 +2,7 @@
 
 `vue-test-utils`は Vue.js 向けの公式単体テストライブラリです。
 
-* [ガイド](guides/README.md)
+* [ガイド](guides/)
   * [はじめる](guides/getting-started.md)
   * [一般的なヒント](guides/common-tips.md)
   * [キー、マウス、その他の DOM イベントのテスト](guides/dom-events.md)
@@ -13,7 +13,7 @@
   * [非同期動作のテスト](guides/testing-async-components.md)
   * [Vue Router と一緒に使う](guides/using-with-vue-router.md)
   * [Vuex と一緒に使う](guides/using-with-vuex.md)
-* [API](api/README.md)
+* [API](api/)
   * [mount](api/mount.md)
   * [shallowMount](api/shallowMount.md)
   * [render](api/render.md)
@@ -31,7 +31,7 @@
     - [provide](api/options.md#provide)
     - [sync](api/options.md#sync)
     - [その他のオプション](api/options.md#その他のオプション)
-  * [Wrapper](api/wrapper/README.md)
+  * [Wrapper](api/wrapper/)
     * [attributes](api/wrapper/attributes.md)
     * [classes](api/wrapper/classes.md)
     * [contains](api/wrapper/contains.md)
@@ -53,7 +53,7 @@
     * [text](api/wrapper/text.md)
     * [trigger](api/wrapper/trigger.md)
     * [isVisible](api/wrapper/isVisible.md)
-  * [WrapperArray](api/wrapper-array/README.md)
+  * [WrapperArray](api/wrapper-array/)
     * [at](api/wrapper-array/at.md)
     * [contains](api/wrapper-array/contains.md)
     * [exists](api/wrapper/exists.md)
@@ -67,7 +67,7 @@
     * [setProps](api/wrapper-array/setProps.md)
     * [trigger](api/wrapper-array/trigger.md)
     * [isVisible](api/wrapper-array/isVisible.md)
-  * [コンポーネント](api/components/README.md)
+  * [コンポーネント](api/components/)
     * [TransitionStub](api/components/TransitionStub.md)
     * [TransitionGroupStub](api/components/TransitionGroupStub.md)
     * [RouterLinkStub](api/components/RouterLinkStub.md)