Update serde_json dependency to version 1.0 (#250)

* Update serde_json dependency to version 1.0

* Update serde_json version in top-level Cargo.toml

* Support serde_json 0.9 and 1.*

Author: kimrutherford

postgres-shared/Cargo.toml

@@ -27,6 +27,6 @@ chrono = { version = "0.3", optional = true }
 eui48 = { version = "0.1", optional = true }
 geo = { version = "0.4", optional = true }
 rustc-serialize = { version = "0.3", optional = true }
-serde_json = { version = "0.9", optional = true }
+serde_json = { version = ">=0.9,<2.0", optional = true }
 time = { version = "0.1.14", optional = true }
 uuid = { version = "0.4", optional = true }

postgres/Cargo.toml

@@ -60,6 +60,6 @@ chrono = "0.3"
 eui48 = "0.1"
 geo = "0.4"
 rustc-serialize = "0.3"
-serde_json = "0.9"
+serde_json = ">=0.9,<2.0"
 time = "0.1.14"
 uuid = "0.4"