readme: fix urls

Merge branch 'develop'

# Conflicts:
#	CHANGELOG.md

Merge branch 'develop'

# Conflicts:
#	port/windows-winusb-intel/main.c
#	port/windows-winusb/main.c
#	src/ble/sm.c
#	src/hci.c
#	src/hci.h
#	src/l2cap.c

Merge branch 'develop'

# Conflicts:
#	port/windows-winusb-intel/main.c
#	port/windows-winusb/main.c
#	src/ble/sm.c
#	src/hci.c
#	src/hci.h
#	src/l2cap.c

Merge branch 'develop'

a2dp_source_demo: fix compile without stdin

btstack_memory: fix memory tracking for malloc config

Merge branch 'develop'