Update README.md

correct spelling of "exert"
Merge pull request #106 from EagleEyeJohn/patch-1

Update README.md
Return FALSE on bit shift by negative number
Fixed 64-bit tests
Fixed 32-bit test
Prevent bit shift count wrapping quirkiness on some CPUs for right shift
Updated >> 64-bit tests
Cast NaN and Infinity to zero
Prevent bit shift count wrapping quirkiness on some CPUs for left shift
Updated << 64-bit tests
Updated 32-bit << test
Use zend_ polyfilled nan/finite, check finite
Error on multiple default blocks in a switch

Part of RFC: https://wiki.php.net/rfc/switch.default.multiple
Don't run travis against master (phpng)
Fix bug #111 (compile error without ZEND_SIGNALS)
Merge phpdbg into PHP-5.6
Fix NEWS
- #65641 mod_proxy-fcgi is not fixed (still open)
- #67606 mod_fastcgi is fixed in ee275e34c8b303945945c650d4bc90dcc2ac0b17
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  Fix NEWS - #65641 mod_proxy-fcgi is not fixed (still open) - #67606 mod_fastcgi is fixed in ee275e34c8b303945945c650d4bc90dcc2ac0b17
Fix NEWS
- #65641 mod_proxy-fcgi is not fixed (still open)
- #67606 mod_fastcgi is fixed in ee275e34c8b303945945c650d4bc90dcc2ac0b17
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  Fix NEWS - #65641 mod_proxy-fcgi is not fixed (still open) - #67606 mod_fastcgi is fixed in ee275e34c8b303945945c650d4bc90dcc2ac0b17
  Fix NEWS - #65641 mod_proxy-fcgi is not fixed (still open) - #67606 mod_fastcgi is fixed in ee275e34c8b303945945c650d4bc90dcc2ac0b17