Use newer deps for GHC 8 compatibility (#619)

stack.yaml

@@ -1,15 +1,24 @@
-resolver: lts-5.17
+resolver: lts-6.2
 extra-deps:
   - Ranged-sets-0.3.0
-  - bytestring-tree-builder-0.2.6
+  - bytestring-tree-builder-0.2.7
   - hasql-0.19.12
   - hasql-pool-0.4.1
-  - hasql-transaction-0.4.4.1
-  - packdeps-0.4.2.1
+  - hasql-transaction-0.4.5
+  - jwt-0.7.2
+  - postgresql-binary-0.9.0.1
+  - binary-parser-0.5.2
+  - contravariant-extras-0.3.2
+  - placeholders-0.1
   - postgresql-error-codes-1
-  - postgresql-binary-0.9
+  - success-0.2.6
+  - tuple-th-0.2.5
+  - wai-cors-0.2.5
+  - cryptohash-sha256-0.11.100.0
+  - hackage-security-0.5.2.1
+
 ghc-options:
-  postgrest: -O2 -Werror -Wall -fwarn-monomorphism-restriction -fwarn-missing-exported-sigs -fwarn-identities
+  postgrest: -O2 -Werror -Wall -fwarn-identities
 
 packages:
-- '.'
+- .