get_line <= 3 is not compatible with batteries 3.7
Failure
```
=== ERROR while compiling get_line.3.0.0 =====================================#
context 2.2.0~alpha3~dev | linux/x86_64 | ocaml-base-compiler.4.14.1 | file:///home/opam/opam-repository
path ~/.opam/4.14/.opam-switch/build/get_line.3.0.0
command ~/.opam/opam-init/hooks/sandbox.sh build obuild build
exit-code 6
env-file ~/.opam/log/get_line-7-ea5bd3.env
output-file ~/.opam/log/get_line-7-ea5bd3.out
[1 of 3] Compiling Get_line
File "get_line.ml", line 3, characters 11-18:
3 | module L = BatList
^^^^^^^
Error: Unbound module BatList
Hint: Did you mean List?
```
Signed-off-by: Marcello Seri <marcello.seri@gmail.com>