Update CHANGELOG for new release

CHANGELOG

@@ -1,3 +1,20 @@
+Version - 8.7.1
+---------------
+* Warning text under 'Write image to disk' tab
+* Fix for rpm based distro which did not run due to import error
+* Fix for suse package and it now checks for correct package dependencies
+* Copy only multibootusb directory to USB if user accept installation choice
+* Display human readable size for an ISO in terminal
+* New command line option to skip confirmation message 'try multibootusb -c -h' for more details
+* New command line option to install multiple distros at a time (Windows user should be able to run only under source code)
+* Fix for crash when installing under Install syslinux tab
+* Prevent read only filesystem under Linux
+* Corrected setup file copy location preventing crash
+* Improved multibootusb-pkexec script for working under rpm and deb based distros
+* Create correct policy file during build time for various packages
+* Improved user guide at http://multibootusb.org/page_guide/
+* Various code cleanups
+
 Version - 8.7.0
 ---------------
 * Welcome "Alin Trăistaru (alindt)". He is one of the major contributor for the project