Update progress.md

2015-12-29 13:58:37 +08:00 · 2015-12-29 13:58:37 +08:00 · 39ab5012c9
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 - [x] Chapter 8: Goroutines and Channels
 - [x] 8.1 Goroutines
 - [x] 8.2 Example: Concurrent Clock Server
- - [ ] 8.3 Example: Concu rent Echo Server
+ - [x] 8.3 Example: Concu rent Echo Server
 - [ ] 8.4 Channels
 - [ ] 8.5 Looping in Parallel
 - [x] 8.6 Example: Concurrent Web Crawler