Apply suggestions from code review

Author: mseri

packages/awsm-codegen/awsm-codegen.0.1.0/opam

@@ -9,15 +9,16 @@ bug-reports: "https://github.com/solvuu/awsm/issues"
 depends: [
   "dune" {>= "3.6"}
   "cohttp"
+  "uri-sexp"
   "core" {< "v0.16.0"}
   "core_unix"
   "ocamlformat"
   "ocamlgraph"
-  "ppxlib"
+  "ppxlib" {>= "0.26"}
   "re" {>= "1.7.2"}
   "sedlex" {>= "2.3"}
   "xmlm"
-  "yojson"
+  "yojson" {>= "1.6.0"}
   "odoc" {with-doc}
 ]
 build: [