Tiny updates

README.md

@@ -1,6 +1,6 @@
 # PDF.js
 
-PDF.js is Portable Document Format (PDF) viewer that is built with HTML5.
+PDF.js is a Portable Document Format (PDF) viewer that is built with HTML5.
 
 PDF.js is community-driven and supported by Mozilla Labs. Our goal is to
 create a general-purpose, web standards-based platform for parsing and

src/core/evaluator.js

@@ -20,8 +20,8 @@
            isNum, isStream, isString, JpegStream, Lexer, Metrics,
            MurmurHash3_64, Name, Parser, Pattern, PDFImage, PDFJS, serifFonts,
            stdFontMap, symbolsFonts, getTilingPatternIR, warn, Util, Promise,
-           LegacyPromise, RefSetCache, isRef, TextRenderingMode, CMapFactory,
+           RefSetCache, isRef, TextRenderingMode, CMapFactory, OPS,
-           OPS, UNSUPPORTED_FEATURES, UnsupportedManager, NormalizedUnicodes,
+           UNSUPPORTED_FEATURES, UnsupportedManager, NormalizedUnicodes,
            IDENTITY_MATRIX, reverseIfRtl */
 
 'use strict';