Graduate stew/results -> results (#185)

Since the results package has seen "stable" use for quite a while now,
it's as good time a time as any to release 1.0 and migrate it out of
stew, thus signalling API stability of some sort.

Part of that "stabilization" is underway in the nim-results [issue
tracker](arnetheduck/nim-results#30).

README.md

@@ -28,7 +28,7 @@ respective folders
 - `leb128` - utilities for working with LEB128-based formats (such as the varint style found in protobuf)
 - `objects` - get an object's base type at runtime, as a string
 - `ptrops` - pointer arithmetic utilities
-- `result` - friendly, exception-free value-or-error returns, similar to `Option[T]`, from [nim-result](https://github.com/arnetheduck/nim-result/)
+- `result` - moved to [nim-results](https://github.com/arnetheduck/nim-results/)
 - `shims` - backports of nim `devel` code to the stable version that Status is using
 - `sequtils2` - extensions to the `sequtils` module for working conveniently with `seq`
 

stew.nimble

@@ -8,6 +8,7 @@ license       = "MIT or Apache License 2.0"
 skipDirs      = @["tests"]
 
 requires "nim >= 1.2.0",
+         "results",
          "unittest2"
 
 let nimc = getEnv("NIMC", "nim") # Which nim compiler to use