[Fix] aW doesn't work at the end of lines

[tyru]

What this PR does / why we need it

This fixes aW behavior at the WORD (big word) of the end of line or the end of document.

Which issue(s) this PR fixes

Fixes #2571

[TravisBuddy]

Travis tests have failed

Hey @tyru,
Please read the following log in order to understand the failure reason.
It'll be awesome if you fix what's wrong and commit the changes.

Node.js: 8

if [[ $(git diff-index HEAD --) ]]; then git diff; echo "Prettier Failed. Run `gulp` or `gulp forceprettier`"; exit 1; fi

diff --git a/src/actions/textobject.ts b/src/actions/textobject.ts
index 041e458..d8294ff 100644
--- a/src/actions/textobject.ts
+++ b/src/actions/textobject.ts
@@ -109,7 +109,7 @@ export class SelectABigWord extends TextObjectMovement {
       if (
         (nextWord.line > position.line || nextWord.isAtDocumentEnd()) &&
         vimState.recordedState.count === 0
-       ) {
+      ) {
         if (position.getLastBigWordEnd().isLineBeginning()) {
           start = position.getLastBigWordEnd();
         } else {
diff --git a/test/mode/modeNormal.test.ts b/test/mode/modeNormal.test.ts
index 8c0ff71..75768ad 100644
--- a/test/mode/modeNormal.test.ts
+++ b/test/mode/modeNormal.test.ts
@@ -795,28 +795,28 @@ suite('Mode Normal', () => {
   });
 
   newTest({
-    title: "Can handle 'daW' around word at the last WORD (class=\"btn\"|>)",
+    title: 'Can handle \'daW\' around word at the last WORD (class="btn"|>)',
     start: ['<div class="btn"|>', 'foo'],
     keysPressed: 'daW',
     end: ['<di|v', 'foo'],
   });
 
   newTest({
-    title: "Can handle 'daW' around word at the last WORD of the end of document (class=\"btn\"|>)",
+    title: 'Can handle \'daW\' around word at the last WORD of the end of document (class="btn"|>)',
     start: ['<div class="btn"|>'],
     keysPressed: 'daW',
     end: ['<di|v'],
   });
 
   newTest({
-    title: "Can handle 'daW' around word at the last WORD (c|lass=\"btn\">)",
+    title: 'Can handle \'daW\' around word at the last WORD (c|lass="btn">)',
     start: ['<div c|lass="btn">', 'foo'],
     keysPressed: 'daW',
     end: ['<di|v', 'foo'],
   });
 
   newTest({
-    title: "Can handle 'daW' around word at the last WORD of the end of document (c|lass=\"btn\">)",
+    title: 'Can handle \'daW\' around word at the last WORD of the end of document (c|lass="btn">)',
     start: ['<div c|lass="btn">'],
     keysPressed: 'daW',
     end: ['<di|v'],
Warning: The 'no-use-before-declare' rule requires type information.
Prettier Failed. Run [21:14:50] Using gulpfile ~/build/VSCodeVim/Vim/gulpfile.js
[21:14:50] Starting 'prettier'...
[21:14:50] Starting 'tslint'...
[21:14:50] Starting 'compile'...
[21:14:52] Finished 'prettier' after 1.64 s
[21:15:07] Finished 'tslint' after 16 s
src/common/motion/position.ts(975,42): error TS2345: Argument of type 'number | ((start?: number | undefined, end?: number | undefined) => number[]) | ((...items: numbe...' is not assignable to parameter of type 'number'.
  Type '(start?: number | undefined, end?: number | undefined) => number[]' is not assignable to type 'number'.
TypeScript: 1 semantic error
TypeScript: emit succeeded (with errors)
[21:15:16] Finished 'compile' after 26 s
[21:15:16] Starting 'default'...
[21:15:16] Finished 'default' after 42 μs or [21:15:17] Using gulpfile ~/build/VSCodeVim/Vim/gulpfile.js
[21:15:17] Starting 'forceprettier'...
[21:15:27] Finished 'forceprettier' after 9.43 s