Log Message:
Update ruby-RMagick to 2.13.4.

RMagick 2.13.4
    #129 from @theschoolmaster
      proof of concept for using pkg-config in place of Magick-config on debian \ 
based systems

    #127 from @u338steven
      Changed Image#resample to calling ResampleImage (related #29, #45)

    #124 from @u338steven
      Fixed #122: lib/RMagick.rb is overwritten by lib/rmagick.rb on \ 
case-insensitive systems

    #123 from @prijutme4ty
      New class SolidFill in order to fill image with monochromatic background

    #121 from @markotom
      Quotes for correct path of font file

    #120 from @chulkilee
      Allow MagickCore6 from Magick-config

    #112 from @u338steven/
      Fixed: build error with ImageMagick 6.8.9 (when deprecated functions are \ 
excluded)

    #102 from @u338steven
      Fixed: related x_resolution, y_resolution

    from @u338steven
      Lots of test fixes

    #95 from @ioquatix
      Fix pixel hash test

    #94 from @u338steven
      Fixed: build error on Windows Ruby x64 (with ImageMagick 6.8.0-10 or Ima...

    #91 from @vassilevsky
      Do not test machine and OS-specific integers
      Fix initial memory limit test

RMagick 2.13.3
    #90 from @bricef
      Fix installation error on systems with HRDI enabled RMagick