Fix the inconsistent single/double quotes (#12)

Author: hokein

.clang-format

@@ -1,3 +1,4 @@
 BasedOnStyle: LLVM
 # Objects like {a: 0}, not { a : 0 }.
 SpacesInContainerLiterals: false
+JavaScriptQuotes: Single

src/extension.ts

@@ -24,7 +24,7 @@ class ClangdLanguageClient extends vscodelc.LanguageClient {
   // prompt up the failure to users.
   logFailedRequest(rpcReply: vscodelc.RPCMessageType, error: any) {
     if (error instanceof vscodelc.ResponseError &&
-        rpcReply.method === "workspace/executeCommand")
+        rpcReply.method === 'workspace/executeCommand')
       vscode.window.showErrorMessage(error.message);
     // Call default implementation.
     super.logFailedRequest(rpcReply, error);
@@ -92,7 +92,7 @@ export function activate(context: vscode.ExtensionContext) {
               let prefix =
                   document.getText(new vscode.Range(item.range.start, position))
               if (prefix)
-              item.filterText = prefix + "_" + item.filterText;
+              item.filterText = prefix + '_' + item.filterText;
               return item;
             })
             return new vscode.CompletionList(items, /*isIncomplete=*/ true);

src/semantic-highlighting.ts

@@ -1,5 +1,5 @@
 import * as fs from 'fs';
-import * as jsonc from "jsonc-parser";
+import * as jsonc from 'jsonc-parser';
 import * as path from 'path';
 import * as vscode from 'vscode';
 import * as vscodelc from 'vscode-languageclient';