Feature/v1.5.0 (#234)

* update python to 311, 312

* update github actions

* deprecate Python 3.6 3.7

* update cibuildwheels

* fix setup.py

* update

* fix upload-artifact

* update boost version

* use c++14

* add BOOST_NO_CXX98_FUNCTION_BASE

* use download-artifact@v2

* use download-artifact@v3

* remove i686

* update badge

* fix readme

* update version to 1.5.0

pyqubo/package_info.py

@@ -1,6 +1,6 @@
 # (major, minor, patch, prerelease)
 
-VERSION = (1, 4, 0, "")
+VERSION = (1, 5, 0, "")
 __shortversion__ = '.'.join(map(str, VERSION[:3]))
 __version__ = '.'.join(map(str, VERSION[:3])) + "".join(VERSION[3:])