Added gs 9.27 + pstoedit 3.74 incompatibility to requirements_check

See issue textext#126

Author: jcwinkler

extension/textext/requirements_check.py

@@ -729,6 +729,8 @@ def help_message_with_url(section_name, executable_name=None):
                             (Requirement(self.find_pstoedit, "3.70") &
                              Requirement(self.find_ghostscript, "9.22")) |
                             (Requirement(self.find_pstoedit, "3.73") &
+                             Requirement(self.find_ghostscript, "9.27")) |
+                            (Requirement(self.find_pstoedit, "3.74") &
                              Requirement(self.find_ghostscript, "9.27"))
                     ).overwrite_check_message("Detect incompatible versions of pstoedit+ghostscript")
                     & (