qmake: make it easy to include pri. Define QARCHIVE_STATIC in pri.

[RELEASE v2.1.0] QArchive v2.1.0 💖

[RELEASE v2.0.2] QArchive v2.0.2 (Fixes antony-jr#41).

[RELEASE v2.0.1] QArchive v2.0.1.

Update docs.

Update README.md

Fix: Install Script!

Merge pull request antony-jr#4 from antony-jr/fix_bad_practice_on_qth…

…read

Fix bad practice on qthread

corrected a nitpick in the examples!