Update changelog of the python client for v0.4.0 release #54

Job	Run time
Call Ledger guidelines_enforcer / Retrieve application metadata / Retrieve application metadata	11s
Call Ledger guidelines_enforcer / Get workflow version / Get workflow version	6s
Call Ledger guidelines_enforcer / Dispatch check / Check readme	5s
Call Ledger guidelines_enforcer / Dispatch check	0s
Call Ledger guidelines_enforcer / Dispatch check / Clang Static Analyzer (stax)	2m 21s
Call Ledger guidelines_enforcer / Dispatch check / Clang Static Analyzer (nanos)	1m 48s
Call Ledger guidelines_enforcer / Dispatch check / Clang Static Analyzer (nanox)	1m 55s
Call Ledger guidelines_enforcer / Dispatch check / Clang Static Analyzer (nanosp)	1m 58s
Call Ledger guidelines_enforcer / Dump app information / Get application manifest for supported devices (stax)	2m 53s
Call Ledger guidelines_enforcer / Dump app information / Get application manifest for supported devices (nanos)	2m 12s
Call Ledger guidelines_enforcer / Dump app information / Get application manifest for supported devices (nanox)	2m 26s
Call Ledger guidelines_enforcer / Dump app information / Get application manifest for supported devices (nanosp)	2m 15s
Call Ledger guidelines_enforcer / Dispatch check / Check APP_LOAD_PARAMS	5s
Call Ledger guidelines_enforcer / Dispatch check / Check Makefile	17s
Call Ledger guidelines_enforcer / Dispatch check / Check icons	1m 38s
	20m 10s

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