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pb-plugin is not compatible with batteries 3.7

Fails with
```
=== ERROR while compiling pb-plugin.1.0.0 ====================================#
context 2.2.0~alpha3~dev | linux/x86_64 | ocaml-base-compiler.5.0.0 | file:///home/opam/opam-repository
path ~/.opam/5.0/.opam-switch/build/pb-plugin.1.0.0
command ~/.opam/opam-init/hooks/sandbox.sh build dune build -p pb-plugin -j 255 @install
exit-code 1
env-file ~/.opam/log/pb-plugin-7-06f870.env
output-file ~/.opam/log/pb-plugin-7-06f870.out
(cd _build/default && /home/opam/.opam/5.0/bin/ocamlc.opt -w -40 -g -bin-annot -I pb-plugin/src/.pb_plugin.eobjs/byte -I /home/opam/.opam/5.0/lib/angstrom -I /home/opam/.opam/5.0/lib/batteries -I /home/opam/.opam/5.0/lib/faraday -I /home/opam/.opam/5.0/lib/integers -I /home/opam/.opam/5.0/lib/pb -no-alias-deps -o pb-plugin/src/.pb_plugin.eobjs/byte/protobuf_reified.cmo -c -impl pb-plugin/src/protobuf_reified.ml)
File "pb-plugin/src/protobuf_reified.ml", line 8, characters 16-30:
8 | let failf fmt = Printf.kprintf failwith fmt
^^^^^^^^^^^^^^
Alert deprecated: Stdlib.Printf.kprintf
Use Printf.ksprintf instead.
(cd _build/default && /home/opam/.opam/5.0/bin/ocamlopt.opt -w -40 -g -I pb-plugin/src/.pb_plugin.eobjs/byte -I pb-plugin/src/.pb_plugin.eobjs/native -I /home/opam/.opam/5.0/lib/angstrom -I /home/opam/.opam/5.0/lib/batteries -I /home/opam/.opam/5.0/lib/faraday -I /home/opam/.opam/5.0/lib/integers -I /home/opam/.opam/5.0/lib/pb -intf-suffix .ml -no-alias-deps -o pb-plugin/src/.pb_plugin.eobjs/native/protobuf_reified.cmx -c -impl pb-plugin/src/protobuf_reified.ml)
File "pb-plugin/src/protobuf_reified.ml", line 8, characters 16-30:
8 | let failf fmt = Printf.kprintf failwith fmt
^^^^^^^^^^^^^^
Alert deprecated: Stdlib.Printf.kprintf
Use Printf.ksprintf instead.
(cd _build/default && /home/opam/.opam/5.0/bin/ocamlc.opt -w -40 -g -bin-annot -I pb-plugin/src/.pb_plugin.eobjs/byte -I /home/opam/.opam/5.0/lib/angstrom -I /home/opam/.opam/5.0/lib/batteries -I /home/opam/.opam/5.0/lib/faraday -I /home/opam/.opam/5.0/lib/integers -I /home/opam/.opam/5.0/lib/pb -no-alias-deps -o pb-plugin/src/.pb_plugin.eobjs/byte/pb_plugin.cmo -c -impl pb-plugin/src/pb_plugin.ml)
File "pb-plugin/src/pb_plugin.ml", line 14, characters 16-30:
14 | let failf fmt = Printf.kprintf (fun s -> raise (Error s)) fmt
^^^^^^^^^^^^^^
Alert deprecated: Stdlib.Printf.kprintf
Use Printf.ksprintf instead.
File "pb-plugin/src/pb_plugin.ml", line 278, characters 18-23:
278 | let stdin_buf = BatIO.(read_all stdin) in
^^^^^
Error: Unbound module BatIO
```

Signed-off-by: Marcello Seri <marcello.seri@gmail.com>

Changed files
+1 -1
packages
pb-plugin
pb-plugin.1.0.0
+1 -1
packages/pb-plugin/pb-plugin.1.0.0/opam
···
"pb"
"dune" {>= "1.11"}
"integers"
-
"batteries"
+
"batteries" {< "3.7"}
"angstrom" {>= "0.10.0"}
"faraday"
"ounit" {with-test & >= "2.0"}