Don't request a breaking version of postgres

jyn514 · jyn514 · commit fe4057afaea6 · 2020-01-13T20:32:30.000-05:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -10,4 +10,4 @@ repository = "https://github.com/SkylerLipthay/schemamama_postgres"
 
 [dependencies]
 schemamama = ">=0.1"
-postgres = ">=0.13"
+postgres = ">=0.13, <=0.15"
