docs: remove unnecessary space to avoid generation failures (#116)

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<!-- What changes are being made? (What feature/bug is being fixed here?) -->
**What**: remove unnecessary space

<!-- Why are these changes necessary? -->
**Why**:  generate command will not generate files because of extra space

<!-- How were these changes implemented? -->
**How**: remove space

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**Checklist**:
<!-- add "N/A" to the end of each line that's irrelevant to your changes -->
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- [x] Documentation
- [x] Tests
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README.md

@@ -90,7 +90,7 @@ Below we'll just show `all-contributors` to keep things simple, but if you're ha
 Please add following placeholders in [`files`](#configuration) to specify the generation area first.
 
 <pre>
-&lt;!-- ALL-CONTRIBUTORS-<!-- hack break -->LIST: START - Do not remove or modify this section --&gt;
+&lt;!-- ALL-CONTRIBUTORS-<!-- hack break -->LIST:START - Do not remove or modify this section --&gt;
 &lt;!-- ALL-CONTRIBUTORS-<!-- hack break -->LIST:END --&gt;
 </pre>