Update progress.md

2015-12-16 14:29:21 +08:00 · 2015-12-16 14:29:21 +08:00 · 0649e2c5c9
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 - [ ] 3.1 Integers
 - [ ] 3.2 Floating-Point Numbers
 - [ ] 3.3 Complex Numbers
- - [ ] 3.4 Booleans
+ - [x] 3.4 Booleans
 - [ ] 3.5 Strings
 - [ ] 3.6 Constants
 - [ ] Chapter 4: Composite Types