main Refresh dependencies (#47)
* Update bitcoinj to 0.15.10
* Update JUnit to 4.13.2
* Update slf4j to 1.7.30
* Update Guava to 30.0
* Update Protobuf to 3.13
* Update OkHttp to 3.12.12
* Remove unused EasyMock
* Make gradlew executable
* Refresh Travis configuration
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