Update progress.md

2015-12-18 21:31:44 +08:00 · 2015-12-18 21:31:44 +08:00 · c42c996231
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 - [x] Chapter 3: Basic Data Types
 - [ ] 3.1 Integers
 - [ ] 3.2 Floating-Point Numbers
- - [ ] 3.3 Complex Numbers
+ - [x] 3.3 Complex Numbers
 - [x] 3.4 Booleans
 - [x] 3.5 Strings
 - [ ] 3.6 Constants