Only lock down postgres-shared

Author: carols10cents

Cargo.lock

@@ -27,6 +27,12 @@ git2 = "0.6.4"
 flate2 = "0.2"
 semver = "0.5"
 url = "1.2.1"
+
+# Needs to be locked down because postgres-shared 0.2.1 allows serde_json 1.0.
+# When postgres, diesel, and this repo can be updated to all use serde_json >1.0,
+# this restriction can be removed.
+postgres-shared = "=0.2.0"
+
 postgres = { version = "0.14.0", features = ["with-time", "with-openssl", "with-serde_json", "with-chrono"] }
 r2d2 = "0.7.0"
 r2d2_postgres = "0.12.0"