Merge pull request #694 from ocharles/patch-1

Add some of @ocharles' packages to Stackage

build-constraints.yaml

@@ -1173,6 +1173,15 @@ packages:
         - monad-peel
         - Network-NineP
 
+    "Oliver Charles <ollie@ocharles.org.uk>":
+        - engine-io
+        - diff3
+        - digestive-functors-aeson
+        - exhaustive
+        - libsystemd-journal
+        - network-carbon
+        - socket-io
+
     "Stackage upper bounds":
         # https://github.com/fpco/stackage/issues/537
         - zlib < 0.6