Log Message:
ImageMagick: update to 7.0.7.28.

2018-03-24  7.0.7-28 Cristy  <quetzlzacatenango@image...>
  * Release ImageMagick version 7.0.7-28, GIT revision 23615:edd71782e:20180325.

2018-03-21  7.0.7-28  <quetzlzacatenango@image...>
  * Fixed numerous use of uninitialized values, integer overflow, memory
    exceeded, and timeouts (credit to OSS Fuzz).

2018-03-18  7.0.7-27 Cristy  <quetzlzacatenango@image...>
  * Release ImageMagick version 7.0.7-27, GIT revision 23466:734b146df:20180318.

2018-03-17  7.0.7-27  <quetzlzacatenango@image...>
  * Fixed numerous use of uninitialized values, integer overflow, memory
    exceeded, and timeouts (credit to OSS Fuzz).