Add Richard Eisenberg's packages

build-constraints.yaml

@@ -92,8 +92,6 @@ packages:
         - th-expand-syns
         - criterion
         - th-lift
-        - singletons
-        - th-desugar
         - quickcheck-assertions
 
         # GHC 8 - hackage-mirror
@@ -2228,6 +2226,14 @@ packages:
     "Drew Hess <src@drewhess.com> @dhess":
         - hpio
 
+    "Richard Eisenberg <eir@cis.upenn.edu> @goldfirere":
+        - th-desugar
+        - singletons
+        - units
+        - units-defs
+        - HUnit-approx
+        - units-parser
+
     # If you stop maintaining a package you can move it here.
     # It will then be disabled if it starts causing problems.
     # See https://github.com/fpco/stackage/issues/1056