update NEWS.md

NEWS.md

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+# rapiclient 0.1.6
+
+## User visible changes
+
+* when functions that have signatures like `fun(x, ..., .__body__ = list(y))`,
+where `x` is a argument for the 'URL' of the RESTful interface, and `y` is an
+argument for the 'BODY' of POST and similar requests. The `...` provide backward
+compatibility, and is used to populate elements of `.__body__`; the full
+interface is required when URL and BODY have identically named arguments
+(@mtmorgan)
+
+## Bug fixes and minor improvements
+
+* allow positional matching for `.body` arguments (@mtmorgan)
+* when `.body` consists of 1 argument, it is represented as an unnamed set
+(@mtmorgan)
+* support argument names duplicated in `.body` (@mtmorgan)
+
 # rapiclient 0.1.5
 
 ## New features