Update progress.md

2016-01-08 18:13:27 +08:00 · 2016-01-08 18:13:27 +08:00 · d974fbca91
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 - [ ] 9.1 Race Conditions
 - [ ] 9.2 Mutual Exclusion: sync.Mutex
 - [x] 9.3 Read/Write Mutexes: sync.RWMutex
- - [ ] 9.4 Memory Synchronization
+ - [x] 9.4 Memory Synchronization
 - [ ] 9.5 Lazy Initialization: sync.Once
 - [x] 9.6 The Race Detector
 - [ ] 9.7 Example: Concurrent Non-Blocking Cache