nanasess/mdb2 を使用する

[nanasess]

• refs dependabot のエラー #542
• pear/MDB2 をフォークした nanasess/mdb2 を使用するよう修正
  • silverorange/mdb2: "2.5.2-b.5" は、minimum-stability: beta 扱いなので dependabot がエラーになってしまう
    • 2.6.x 以降は変更が大きすぎて動作しないため、 pear/MDB2 からフォークする

[nanasess]

Windows 環境でのエラーは #526 で対応済み

[chihiro-adachi]

@nanasess
composer.lockのコンフリクト解消おねがいできますでしょうか。

[nanasess]

@chihiro-adachi 解消しました

[codecov-commenter]

Codecov Report

Merging #547 (aea7702) into master (2f6eb97) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #547   +/-   ##
=======================================
  Coverage   54.63%   54.63%           
=======================================
  Files          76       76           
  Lines        9058     9058           
=======================================
  Hits         4949     4949           
  Misses       4109     4109           

Flag	Coverage Δ
tests	54.63% <ø> (ø)

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