Rename CompareType to compareResult to make it private. This type is
used only in internal functions and is of no use for external users and
should never have been made public.
CompareType has been introduced by 0b4ff03cda5c8eb0150a14ffbaaa088fd777d6ba
and appeared in releases since v1.6.0.
Note: strictly speaking, this is a breaking change, but no external user
should have ever used assert.CompareType as it made no sense in the assert
API. A search on GitHub has revealed no use of it.
https://github.com/search?q=assert.CompareType+language%3AGo&type=Repositories&ref=advsearch&l=Go&l=
Prior to this commit, this would not work:
```go
type myInt int
assert.Less(t, myInt(1), myInt(2)) // panic!
```
We add some type conversions, similarly to how `ObjectsAreEqualValues`
work. This allows us to compare `myInt` to `myInt`, as well as `myInt`
to `int`.
