Update progress.md

2016-01-03 19:56:39 +08:00 · 2016-01-03 19:56:39 +08:00 · e0a5eb9474
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 - [x] Chapter 7: Interfaces
 - [x] 7.1 Interfaces as Contracts
 - [x] 7.2 Interface Types
- - [ ] 7.3 Interface Satisfaction
+ - [x] 7.3 Interface Satisfaction
 - [ ] 7.4 Parsing Flags with flag.Value
 - [ ] 7.5 Interface Values
 - [ ] 7.6 Sorting with sort.Interface