removed dependency on ext-mbstring

[prisis]

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Related tickets	-
License	MIT
Doc PR	-

[codecov]

Codecov Report

Merging #94 into master will not change coverage.
The diff coverage is 68.96%.

@@            Coverage Diff            @@
##             master      #94   +/-   ##
=========================================
  Coverage     70.91%   70.91%           
  Complexity      812      812           
=========================================
  Files            54       54           
  Lines          2180     2180           
=========================================
  Hits           1546     1546           
  Misses          634      634

Impacted Files	Coverage Δ	Complexity Δ
src/Automatic/Prefetcher/CurlDownloader.php	8.82% <0%> (ø)	44 <0> (ø)	⬇️
...c/Common/Installer/AbstractInstallationManager.php	17.94% <0%> (ø)	22 <0> (ø)	⬇️
src/Automatic/Prefetcher/ParallelDownloader.php	10.4% <0%> (ø)	60 <0> (ø)	⬇️
src/Automatic/Prefetcher/Prefetcher.php	9.3% <0%> (ø)	38 <0> (ø)	⬇️
src/Automatic/Installer/InstallationManager.php	0% <0%> (ø)	19 <0> (ø)	⬇️
src/Security/SecurityPlugin.php	84.12% <100%> (ø)	25 <0> (ø)	⬇️
src/Security/Command/Formatter/SimpleFormatter.php	100% <100%> (ø)	6 <0> (ø)	⬇️
src/Automatic/Operation/Install.php	100% <100%> (ø)	32 <0> (ø)	⬇️
src/Common/Configurator/AbstractConfigurator.php	100% <100%> (ø)	7 <0> (ø)	⬇️
src/Security/Downloader/CurlDownloader.php	85.71% <100%> (ø)	6 <0> (ø)	⬇️
... and 11 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update aa853e0...6a5974f. Read the comment docs.