Improve deprecation warnings for commas with whitespace used as using directive value separators

[Gedochao]

Bumps using_directives to 1.1.3.
https://github.com/VirtusLab/using_directives/releases/tag/v1.1.3

The main improvement happens in:

• Remove redundant warning at the beginning of a value followed with a comma using_directives#62

Given:

//> using options -Werror, -Wconf:cat=deprecation:e, -Wconf:cat=unused:e
println("Deprecation warnings should have been printed")

Before:

[warn] ./example.sc:1:19
[warn] Use of commas as separators is deprecated. Only whitespace is neccessary.
[warn] //> using options -Werror, -Wconf:cat=deprecation:e, -Wconf:cat=unused:e
[warn]                   ^
[warn] ./example.sc:1:26
[warn] Use of commas as separators is deprecated. Only whitespace is neccessary.
[warn] //> using options -Werror, -Wconf:cat=deprecation:e, -Wconf:cat=unused:e
[warn]                          ^
[warn] ./example.sc:1:28
[warn] Use of commas as separators is deprecated. Only whitespace is neccessary.
[warn] //> using options -Werror, -Wconf:cat=deprecation:e, -Wconf:cat=unused:e
[warn]                            ^
[warn] ./example.sc:1:52
[warn] Use of commas as separators is deprecated. Only whitespace is neccessary.
[warn] //> using options -Werror, -Wconf:cat=deprecation:e, -Wconf:cat=unused:e
[warn] 

After:

[warn] ./example.sc:1:26
[warn] Use of commas as separators is deprecated. Only whitespace is neccessary.
[warn] //> using options -Werror, -Wconf:cat=deprecation:e, -Wconf:cat=unused:e
[warn]                          ^
[warn] ./example.sc:1:52
[warn] Use of commas as separators is deprecated. Only whitespace is neccessary.
[warn] //> using options -Werror, -Wconf:cat=deprecation:e, -Wconf:cat=unused:e
[warn]                                                    ^