Update CONTRIBUTING.md

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@ -23,6 +23,24 @@ Bug reports must have enough detail to understand and reproduce the problem.
Bug reports without an associated pull request will generally be closed.
However, bug reports with a pull request are likely to be merged promptly.
## FAQ
Please search previous issues for an answer before opening a pull request. A few common ones
are listed here.
### I get a compilation error.
While you can check the build status at [Travis](https://travis-ci.org/zxing/zxing) to confirm,
the project correctly builds and passes tests at all times.
90% of the time it's due to using an old version of Java. Version 3.4+ require Java 8.
Use earlier versions with Java 7 and earlier.
### This barcode doesn't decode.
Not all images will decode. All else equal, more is better, but this is not accepted as a bug
report. A pull request that makes changes to make the barcode decode without decreasing the net
number of barcodes recognized in the unit tests may be considered.
## Licensing
Contributions via GitHub pull requests are gladly accepted from their original author.