Fix sedlex and ppx_tools_versioned interaction

[samoht]

No description provided.

[camelus]

❗ opam-lint warnings 5dec19e

• flow_parser.0.44.0 has some warnings:

  • warning 26: No field 'install', but a field 'remove': install instructions probably part of 'build'. Use the 'install' field or a .install file

• These packages passed lint tests: flowtype.0.49.1, flowtype.0.50.0, flowtype.0.51.0, flowtype.0.52.0, flowtype.0.53.0, flowtype.0.56.0, flowtype.0.57.2, flowtype.0.58.0, sedlex.1.99.4

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✅ Installability check (9299 → 9299)

[mseri]

Travis Times out in ocaml 4.03 to 4.05 but I don’t see errors. I think it is because it is only trying to build and test too many packages