v0.2.0 (17/05/2018)

• Explicitly depend on sexplib in jbuild description.
• Remove use of deprecated build variables in jbuild file.
• Add a Yaml_unix module with functions to read and write from files directly.
• Eliminate runtime dependency on Str (#10 from @yallop)
• Various build fixes (#9 #8 #7 from @diml @rgrinberg).