Update free-programming-books.md

Added free book on partial evaluation.

free-programming-books.md

@@ -78,6 +78,7 @@
     * [Open Source Ecosystem](#open-source-ecosystem)
     * [Operating systems](#operating-systems)
     * [Parallel Programming](#parallel-programming)
+    * [Partial Evaluation](#partial-evaluation)
     * [Professional Development](#professional-development)
     * [Programming Paradigms](#programming-paradigms)
     * [Regular Expressions](#regular-expressions)
@@ -451,6 +452,9 @@
 * [Programming on Parallel Machines; GPU, Multicore, Clusters and More](http://heather.cs.ucdavis.edu/parprocbook) - Norm Matloff
 * [The OpenCL Programming Book](http://www.fixstars.com/en/opencl/book/OpenCLProgrammingBook/contents/)
 
+####Partial Evaluation
+* [Partial Evaluation and Automatic Program Generation](http://www.itu.dk/people/sestoft/pebook/) - (PDF) Jones, Gomard and Sestoft
+
 
 ####Professional Development
 * [Confessions of an IT Manager](http://download.red-gate.com/ebooks/DotNet/Confessions_IT_Manager.zip) *(RedGate, By Phil Factor)*