Update free-programming-books.md (#4657)

* Update free-programming-books.md

* Update alphabetical order

* Added authors

* Update free-programming-books.md

free-programming-books.md

@@ -671,6 +671,7 @@
 * [HTTP Succinctly, Syncfusion](https://www.syncfusion.com/resources/techportal/ebooks/http) (PDF, Kindle) (email address *requested*, not required)
 * [HTTP2 Explained](http://daniel.haxx.se/http2/) - Daniel Stenberg
 * [IPv6 for IPv4 Experts](https://sites.google.com/site/yartikhiy/home/ipv6book) - Yar Tikhiy (PDF)
+* [Kafka, The definitive Guide](https://assets.confluent.io/m/1b509accf21490f0/original/20170707-EB-Confluent_Kafka_Definitive-Guide_Complete.pdf) - Neha Narkhede (PDF)
 * [Network Science](http://networksciencebook.com) - Albert-Laszló Barabási
 * [The TCP/IP Guide](http://www.tcpipguide.com/free/t_toc.htm)
 * [Understanding IP Addressing: Everything you ever wanted to know](http://pages.di.unipi.it/ricci/501302.pdf) (PDF)
@@ -754,6 +755,7 @@ Kerridge (PDF) (email address *requested*, not required)
 
 * [Flow based Programming](http://jpaulmorrison.com/fbp/) - J Paul Morrison
 * [Introduction to Functional Programming](http://www.cl.cam.ac.uk/teaching/Lectures/funprog-jrh-1996/) - J. Harrison
+* [Making Sense of Stream Processing](https://assets.confluent.io/m/2a60fabedb2dfbb1/original/20190307-EB-Making_Sense_of_Stream_Processing_Confluent.pdf) - Martin Kleppmann (PDF)
 * [Mostly Adequate Guide to Functional Programming](https://www.gitbook.com/book/drboolean/mostly-adequate-guide/details)
 * [The Pure Function Pipeline Data Flow v3.0 ---- the Grand Unified Programming Theory](https://github.com/linpengcheng/PurefunctionPipelineDataflow) - Lin Pengcheng
 * [Type Theory and Functional Programming](https://www.cs.kent.ac.uk/people/staff/sjt/TTFP/)