Add Terence's 2013 ANTLR 4 book.

Author: ltratt

softdev.bib

@@ -2174,3 +2174,12 @@ @techreport{ammann78error
     month = May,
     doi = "10.3929/ethz-a-000136031"
 }
+
+@book{parr13definitive,
+    title = "The definitive {ANTLR} 4 reference",
+    author = "Terence Parr",
+    year = 2013,
+    month = Jan,
+    publisher = "Pragmatic Bookshelf",
+    isbn = "1934356999"
+}