Update wasmparser requirement from 0.205 to 0.206 (#103)

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Cargo.toml

@@ -35,7 +35,7 @@ diff = "0.1"
 pretty_assertions = "1"
 rand = "0.8"
 wat = "1"
-wasmparser = "0.205"
+wasmparser = "0.206"
 wasmprinter = "0.200"
 wasmi = "0.31"