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] ^