Update progress.md

2016-01-06 09:04:11 +08:00 · 2016-01-06 09:04:11 +08:00 · cce44f4a91
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 - [x] 5.1 Function Declarations
 - [x] 5.2 Recursion
 - [x] 5.3 Multiple Return Values
- - [ ] 5.4 Errors
+ - [x] 5.4 Errors
 - [ ] 5.5 Function Values
 - [ ] 5.6 Anonymous Functions
 - [ ] 5.7 Variadic Functions