updated vendor

vendor/github.com/bcampbell/qs/README.md

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+[![GoDoc](https://godoc.org/github.com/bcampbell/qs?status.svg)](https://godoc.org/github.com/bcampbell/qs)
+
+## Overview
+
+qs implements a query language for the [Bleve](http://www.blevesearch.com/)
+text indexer library.
+
+The query syntax is aiming to be about the same as those used by
+[Lucene](http://lucene.apache.org/core/5_3_1/queryparser/org/apache/lucene/queryparser/classic/package-summary.html#package_description)
+and [Elasticsearch](https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html#query-string-syntax).
+
+The full syntax is described in [syntax.md](syntax.md).
+
+## Usage
+
+    import "github.com/bcampbell/qs"
+
+    query, err := qs.Parse("grapefruit lemon orange lime")
+
+Or, to create a parse which uses AND as the default operator:
+
+    p := qs.Parser{DefaultOp: qs.AND}
+	query,err := p.Parse("grapefruit lemon orange lime")
+
+
+
+## Quick Examples
+
+Documents containing the term `grapefruit`:
+
+    grapefruit
+
+There is support for boolean AND, OR and NOT:
+
+    grapefruit OR lemon
+    grapefruit AND lemon
+    grapefruit AND NOT lemon
+
+Phrases are indicated with quotes:
+
+    "navel orange"
+
+The default boolean operator is OR, so these two are equivalent when using the default parser:
+
+    grapefruit lemon
+    grapefruit OR lemon
+
+
+Fields:
+
+    tags:citrus
+    headline:"How to Make the Perfect Negroni"
+
+Grouping:
+
+    (lemon AND lime) OR (orange AND grapefruit)
+
+Boosting term relevance:
+
+    fruit grapefruit^2
+
+Inclusive ranges in square brackets, Exclusive ranges in curly brackets:
+
+    date:[2012-01-01 TO 2012-12-31]
+    count:{0 TO 100}
+
+Wildcard markers `*` (any character sequence, 0 or more) and `?` (any single character)
+eg to match `foot`, `fort`, `fret` etc:
+
+    f??t
+
+eg to match `ant`, `anteater`, `antidisestablishmentarianism` etc:
+
+    ant*
+
+
+