Add link to SWF parser

[demurgos]

Prerequisites

Please provide the following information with this pull request:

• related issue number: Example parsers #14
• a test case reproducing the issue: N/A
• if adding a new combinator, please add code documentation and some unit tests
  in the same file: N/A

Description

This commit adds a link to Open Flash's SWF parser implemented using nom. The parser was recently updated to nom 5 add provides a good example for parsing a fairly complex binary format.

[coveralls]

Coverage increased (+0.5%) to 86.786% when pulling ef25df6 on demurgos:link-swf-parser into 8517064 on Geal:master.

[Geal]

nice!