Update progress.md

2015-12-18 18:06:18 +08:00 · 2015-12-18 18:06:18 +08:00 · 8e9fa083e7
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 - [ ] 3.2 Floating-Point Numbers
 - [ ] 3.3 Complex Numbers
 - [x] 3.4 Booleans
- - [ ] 3.5 Strings
+ - [x] 3.5 Strings
 - [ ] 3.6 Constants
 - [ ] Chapter 4: Composite Types
 - [ ] 4.1 Arrays