Add `updateConfig` method #611

Job	Run time
Test bridge-token-factory	3m 4s
Test erc20-bridge-token	35s
Build and diff erc20-connector	2m 7s
Test erc20-connector	1m 51s
Build and diff erc20-bridge-token	56s
Test silo-to-silo	12m 31s
Build and diff bridge-token	1m 32s
Build and diff bridge-token-factory	1m 45s
Test token-locker	1m 38s
Build and diff token-locker	1m 43s
	27m 42s

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