Luqum

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Added
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- support for parsing Regular expressions like `/foo/` (no transformation to Elasticsearch DSL yet)
- basic support for head and tail of expressions (the separators)
and for their position (pos and size) in original text
- added `auto_head_tail` util
(use it if you build your tree programatically and want a printable representation)
- tree item now support a `clone_item` method and a setter for children.
This should help with making transformation pattern easier.
- New `visitor.TreeVisitor` and `visitor.TreeTransformer` classes to help in processing trees
`utils.LuceneTreeVisitor`, `utils.LuceneTreeVisitorV2` and `utils.LuceneTreeTransformer`
are warned as deprecated (but still works).

Changed
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- support for python 3.8 added, support for python 3.4 and 3.5 dropped
- better printing of Proximity and Fuzzy items (preserve implicit nature of degree)
- raise `IllegalCharacterError` on illegal character found instead of printing and skipping
- renamed `ParseError` to `ParseSyntaxError`, and kept `ParseError` as a parent exception

Fixed
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- Range item were not checking for bounds type on equality
- Boost item were not checking for force on equality
- Reorganize tests

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Added
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- support for elasticsearch 7

==================

Added
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- added Apache 2 license, while maintaining LGPLv3+

==================

Added
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- support for `multi_match` query in `ElasticsearchQueryBuilder`.

Fixed
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- SchemaAnalyzer, should count non text fields as not_analyzed
- `ElasticsearchQueryBuilder`'s `field_options` parameter
can accept `match_type` instead of `type` to change request type.
This is now the prefered way over `type`
which may more easily conflict with request parameters.

==================

Added
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- handling sub fields (aka `multi-fields`__)

__ https://www.elastic.co/guide/en/elasticsearch/reference/6.3/multi-fields.html

Fixed
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- fixed bug on equality, having more children in one tree than in the other,
was not triggering inequality if first nodes were the same !

==================

Added
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- handling `special characters escaping`_
- added `iter_wildcards` and `split_wildcards` to have a finer grained search of wildcard in terms

.. _`special characters escaping`: https://lucene.apache.org/core/3_6_0/queryparsersyntax.html#Escaping%20Special%20Characters

Fixed
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- fixed bug in `luqum.utils.LuceneTreeTransformer` when removing node
- fixed bug in handling approx operator on multiple words in
`luqum.elasticsearch.visitor.ElasticsearchQueryBuilder`
- test coverage now check branch