Set jsonld context version to 1.1

[MFSY]

• this enables non IRI-delimiting character not present in rdflib.plugins.shared.jsonld.context.URI_GENDELIMS (e.g '' in "NCBITaxon": "http://purl.obolibrary.org/obo/NCBITaxon_") to be used when defining jsonld context prefix

As mentioned in https://github.com/RDFLib/rdflib/issues/2606, @prefix could be used to signal prefixes to jsonld context 1.1. E.g: "NCBITaxon": {"@id": "http://purl.obolibrary.org/obo/NCBITaxon_", "@prefix": True}

Fixes #386

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (413856a) 74.61% compared to head (66b1a78) 74.61%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #387 +/- ## ======================================= Coverage 74.61% 74.61% ======================================= Files 101 101 Lines 6424 6424 ======================================= Hits 4793 4793 Misses 1631 1631 ``` | [Flag](https://app.codecov.io/gh/BlueBrain/nexus-forge/pull/387/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/BlueBrain/nexus-forge/pull/387/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain) | `74.61% <100.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain#carryforward-flags-in-the-pull-request-comment) to find out more.

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