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hdfs is not compatible with ocaml 5

They use Stream

```
=== ERROR while compiling hdfs.0.4 ===========================================#
context 2.2.0~alpha~dev | linux/x86_64 | ocaml-base-compiler.5.0.0 | file:///home/opam/opam-repository
path ~/.opam/5.0/.opam-switch/build/hdfs.0.4
command ~/.opam/opam-init/hooks/sandbox.sh build ocaml setup.ml -configure --prefix /home/opam/.opam/5.0
exit-code 2
env-file ~/.opam/log/hdfs-7-5514c0.env
output-file ~/.opam/log/hdfs-7-5514c0.out
File "./setup.ml", line 575, characters 4-15:
575 | Stream.from next
^^^^^^^^^^^
Error: Unbound module Stream
```

Moreover hdfs 0.1 uses unsafe string and should have the same upper
bound as hdfs 0.2.

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

Changed files
+3 -3
packages
hdfs
hdfs.0.1
hdfs.0.3
hdfs.0.4
+1 -1
packages/hdfs/hdfs.0.1/opam
···
["ocamlfind" "remove" "hdfs"]
]
depends: [
-
"ocaml" {>= "4.03.0"}
+
"ocaml" {>= "4.03.0" & < "4.10"}
"base-bytes"
"base-unix"
"camlidl"
+1 -1
packages/hdfs/hdfs.0.3/opam
···
["ocamlfind" "remove" "hdfs"]
]
depends: [
-
"ocaml" {>= "4.03.0"}
+
"ocaml" {>= "4.03.0" & < "5.0"}
"base-bytes"
"base-unix"
"camlidl"
+1 -1
packages/hdfs/hdfs.0.4/opam
···
]
install: ["ocaml" "setup.ml" "-install"]
depends: [
-
"ocaml" {>= "4.03.0"}
+
"ocaml" {>= "4.03.0" & < "5.0"}
"base-bytes"
"base-unix"
"camlidl"