Upgrade 743accbe (#112)

* remove dependency pinned revisions. --precise to 743accbe

Author: brenzi

CHANGELOG.md

@@ -0,0 +1,11 @@
+# 0.5.0
+
+support substrate 3.0.0. tested with paritytech/substrate@743accbe3256de2fc615adcaa3ab03ebdbbb4dbd
+
+depend on substrate git without pinning a revision. use `cargo` to select a revision:
+
+```
+# may need to do twice!
+cargo update -p sp-std --precise 743accbe3256de2fc615adcaa3ab03ebdbbb4dbd
+cargo update -p sp-std --precise 743accbe3256de2fc615adcaa3ab03ebdbbb4dbd
+```