Fix: Add exponentiation operators (fixes eslint#280)

Author: azz

lib/node-utils.js

@@ -64,6 +64,7 @@ TOKEN_TO_TEXT[SyntaxKind.EqualsGreaterThanToken] = "=>";
 TOKEN_TO_TEXT[SyntaxKind.PlusToken] = "+";
 TOKEN_TO_TEXT[SyntaxKind.MinusToken] = "-";
 TOKEN_TO_TEXT[SyntaxKind.AsteriskToken] = "*";
+TOKEN_TO_TEXT[SyntaxKind.AsteriskAsteriskToken] = "**";
 TOKEN_TO_TEXT[SyntaxKind.SlashToken] = "/";
 TOKEN_TO_TEXT[SyntaxKind.PercentToken] = "%";
 TOKEN_TO_TEXT[SyntaxKind.PlusPlusToken] = "++";
@@ -85,6 +86,7 @@ TOKEN_TO_TEXT[SyntaxKind.EqualsToken] = "=";
 TOKEN_TO_TEXT[SyntaxKind.PlusEqualsToken] = "+=";
 TOKEN_TO_TEXT[SyntaxKind.MinusEqualsToken] = "-=";
 TOKEN_TO_TEXT[SyntaxKind.AsteriskEqualsToken] = "*=";
+TOKEN_TO_TEXT[SyntaxKind.AsteriskAsteriskEqualsToken] = "**=";
 TOKEN_TO_TEXT[SyntaxKind.SlashEqualsToken] = "/=";
 TOKEN_TO_TEXT[SyntaxKind.PercentEqualsToken] = "%=";
 TOKEN_TO_TEXT[SyntaxKind.LessThanLessThanEqualsToken] = "<<=";