deps: upgrade npm to 6.1.0

PR-URL: https://github.com/nodejs/node/pull/20190
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/deps/npm/node_modules/caseless/README.md b/deps/npm/node_modules/caseless/README.md
new file mode 100644
index 0000000000..e5077a2165
--- /dev/null
+++ b/deps/npm/node_modules/caseless/README.md
@@ -0,0 +1,45 @@
+## Caseless -- wrap an object to set and get property with caseless semantics but also preserve caseing.
+
+This library is incredibly useful when working with HTTP headers. It allows you to get/set/check for headers in a caseless manner while also preserving the caseing of headers the first time they are set.
+
+## Usage
+
+```javascript
+var headers = {}
+  , c = caseless(headers)
+  ;
+c.set('a-Header', 'asdf')
+c.get('a-header') === 'asdf'
+```
+
+## has(key)
+
+Has takes a name and if it finds a matching header will return that header name with the preserved caseing it was set with.
+
+```javascript
+c.has('a-header') === 'a-Header'
+```
+
+## set(key, value[, clobber=true])
+
+Set is fairly straight forward except that if the header exists and clobber is disabled it will add `','+value` to the existing header.
+
+```javascript
+c.set('a-Header', 'fdas')
+c.set('a-HEADER', 'more', false)
+c.get('a-header') === 'fdsa,more'
+```
+
+## swap(key)
+
+Swaps the casing of a header with the new one that is passed in.
+
+```javascript
+var headers = {}
+  , c = caseless(headers)
+  ;
+c.set('a-Header', 'fdas')
+c.swap('a-HEADER')
+c.has('a-header') === 'a-HEADER'
+headers === {'a-HEADER': 'fdas'}
+```