bump version (MaikuB#765)

bump version for 1.5.0-beta.7 release (MaikuB#762)

[flutter_local_notifications] guard code getting intent from activity…

… in case activity doesn't exist (MaikuB#761)

* add guard on getting intent from activity

* revise changelog entry

* revise changelog entry

* fix changelog entry for 1.4.4+4

* fix grammar

format Android code (MaikuB#756)

[flutter_local_notifications] cleanup code and API docs (MaikuB#708)

* fix and update API docs

* cleanup Java code around checking Android versions

* remove use of dyancmi

* remove redundant conditional in example code

* bump plugin and updated more docs

* fix grammar in API docs

* fix Android version mentioned in example app for getActiveNotifications

* update wording in changelog

* mention Android versions that getActiveNotifications is compatible with in changelog

* fix grammar for error message related to calling getActiveNotifications

Merge branch 'master' into time_zone_macos_support

add link to GitHub issue in changelog (MaikuB#700)

bump e2e dev dependency

fix how launch notification details are read on android

update testing section of readme and move it