added point 18 in contribution guidline
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		@@ -15,6 +15,7 @@ Before making a pull request, please make sure of the following:
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            * [Part 2](link_to_part_2)
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					            * [Part 2](link_to_part_2)
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    ```
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					    ```
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* Check the spelling and grammar
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					* Check the spelling and grammar
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					* Do the work, write good commit messages, and read the CONTRIBUTING file if there is one
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* Remove any trailing whitespaces
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					* Remove any trailing whitespaces
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* Links must be pointing straight to the tutorials, no URL shorteners. However, if the URL is too long (more than 80 characters), Google URL Shortener is allowed
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					* Links must be pointing straight to the tutorials, no URL shorteners. However, if the URL is too long (more than 80 characters), Google URL Shortener is allowed
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