Update README.md (Path-Check#138)

Adding a note for developers - not sure if it is meaningful but I hit my head for hours on this!
SamMakesThings · Mar 22, 2020 · 7b1cf8e · 7b1cf8e
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@@ -50,6 +50,10 @@ or
 npx react-native run-ios --simulator="iPhone 8 Plus"
 ```
 
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+NOTE: In some cases, the abovementioned procedure leads to the error 'Failed to load bundle - Could not connect to development server'. In these cases, kill all other react-native processes and try it again.
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+
 ## Contributing
 
 Read the [contribution guidelines](./.github/CONTRIBUTING.md).