Add documentation to warn about edge case
When using non-static inner classes for generators, `com.pholser.junit.quickcheck.internal.ReflectionException: java.lang.InstantiationException` gets thrown.
@@ -21,6 +21,8 @@ junit-quickcheck can instantiate your generator, ensure that it has a
}
```
+If you define your generator as an inner class, ensure that it is static, otherwise
+it will fail at runtime.
## Explicit generators
