Build

bump version to 0.3.0-alpha.7 #7

Job	Run time
build_no_default_features (linux)	1m 59s
build_all_features (linux)	2m 31s
build_feature_esplora (linux)	2m 21s
build_no_default_features (windows)	4m 36s
build_all_features (windows)	6m 18s
build_feature_electrum (linux)	2m 31s
build_feature_esplora (windows)	5m 13s
build_no_default_features (macos)	2m 6s
build_all_features (macos)	3m 0s
build_feature_electrum (windows)	4m 52s
build_feature_esplora (macos)	2m 30s
build_feature_electrum (macos)	2m 44s
	40m 41s

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