Add pcre note in credits

oden-lang · May 15, 2016 · c3f952b · c3f952b
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diff --git a/CREDITS.md b/CREDITS.md
@@ -11,3 +11,11 @@
 The type inferencer is partly adapted from [Write You a Haskell](
 https://github.com/sdiehl/write-you-a-haskell/tree/master/chapter7/poly_constraints)
 under the MIT license.
+
+### PCRE
+
+Regular expression support is provided by the PCRE library package, which is
+open source software, written by Philip Hazel, and copyright by the University
+of Cambridge, England.
+
+Source: ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/