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Update README.md
Update README.md
Test for java8 issue #14
Fix for #12

 * BDDCatchException.then added
Adapt java source level to jdk version
Fixed compilation for different java source levels

 * minimal spring version updated to 3.2.9
 * usage of Assertj Assertions.then is not recomended anymore
Merge pull request #13 from mariuszs/java8issue

Fix for issue #12 and other problems with Java8 compilation
Update README.md