Increase upper bound on optparse-generic (#296)

Author: Gabriella439

dhall.cabal

@@ -140,7 +140,7 @@ Executable dhall
         ansi-terminal               >= 0.6.3.1  && < 0.8 ,
         base                        >= 4        && < 5   ,
         dhall                                            ,
-        optparse-generic            >= 1.1.1    && < 1.3 ,
+        optparse-generic            >= 1.1.1    && < 1.4 ,
         prettyprinter                                    ,
         prettyprinter-ansi-terminal >= 1.1.1    && < 1.2 ,
         trifecta                    >= 1.6      && < 1.8 ,
@@ -171,7 +171,7 @@ Executable dhall-format
         base                        >= 4        && < 5   ,
         ansi-terminal               >= 0.6.3.1  && < 0.8 ,
         dhall                                ,
-        optparse-generic            >= 1.1.1    && < 1.3 ,
+        optparse-generic            >= 1.1.1    && < 1.4 ,
         prettyprinter               >= 1.2.0.1  && < 1.3 ,
         prettyprinter-ansi-terminal >= 1.1.1    && < 1.2 ,
         trifecta                    >= 1.6      && < 1.8 ,
@@ -186,7 +186,7 @@ Executable dhall-hash
     Build-Depends:
         base             >= 4        && < 5  ,
         dhall                                ,
-        optparse-generic >= 1.1.1    && < 1.3,
+        optparse-generic >= 1.1.1    && < 1.4,
         trifecta         >= 1.6      && < 1.8,
         text             >= 0.11.1.0 && < 1.3
     Other-Modules: