Mention JRE requirement more prominently in README

[Marcono1234]

Point 5 of the FAQ mentions in a side note that this project requires at least Java 8.
This requirement is probably rather important for many users of the library and it would be good if this could be mentioned somewhere at the beginning of the README. Though I am not sure which one of the existing sections would fit, so maybe adding a new "Requirements" section would be good?

[srikanth-lingala]

Sure, and actually this point needs to be updated as zip4j supports Java 7 as well. When rewriting zip4j, the minimum version of JDK supported was 8, but based on requests by android app developers, I had to rewrite some parts to supports Java 7 as well to support older Android SDKs.

[Marcono1234]

Should I write a pull request, or do you want to perform this change?

[srikanth-lingala]

I added it to a newly created section Requirements in README.

[Marcono1234]

Thanks. I have left some comments on the commit describing how it could possible be slightly improved.
Feel free to close this issue now.

[Marcono1234]

@srikanth-lingala, have you seen my comments on your commit 1bbb90c?

[srikanth-lingala]

Actually, I just had a look at them. And they are now fixed.