add manual instruction set modifications for ttfautohint U+002B, regular set (#298)

postbuild_processing/tt-hinting/Hack-Regular-TA.txt

@@ -6,3 +6,6 @@
 
 # U+0023 numbersign glyph ID 582
 uni0023 touch 0,1,2,3,18,19,20,21,22,23,24,25,26,27,28,31 x 0.25  @ 13
+
+# U+002B plus glyph ID 764
+uni002B touch 4,5 y 1.0 @ 12,13