dboyliao
2015-11-25
Update README.md
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- [link](http://www.oodesign.com/single-responsibility-principle.html) |
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- `O`: Open/Close Principle. |
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- [link](http://joelabrahamsson.com/a-simple-example-of-the-openclosed-principle/) |
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- - `L`: |
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+ - `L`: Liskov Substitution Principle. |
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+ - [link](http://www.objectmentor.com/resources/articles/lsp.pdf) |
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+ - [Circle-Ellipse Problem](https://en.wikipedia.org/wiki/Circle-ellipse_problem) |
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| 12 | 14 |
- `I`: |
| 13 | 15 |
- `D`: |
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