update progress.md

2016-01-19 00:17:22 +08:00 · 2016-01-19 00:17:22 +08:00 · 10739848c5
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 - [x] 7.8 The error Interface
 - [x] 7.9 Example: Expression Evaluator
 - [x] 7.10 Type Assertions
- - [ ] 7.11 Discriminating Errors with Type Assertions
- - [ ] 7.12 Querying Behaviors with Interface Type Assertions
+ - [x] 7.11 Discriminating Errors with Type Assertions
+ - [x] 7.12 Querying Behaviors with Interface Type Assertions
 - [ ] 7.13 Type Switches
 - [ ] 7.14 Example: Token-Based XML Decoding
 - [ ] 7.15 A Few Words of Advice