Fix: exit with error when failed to resolve dependencies

Author: ysbaddaden

src/commands/install.cr

@@ -32,7 +32,7 @@ module Shards
           solver.each_conflict do |message|
             Shards.logger.warn { "Conflict #{message}" }
           end
-          Shards.logger.error { "Failed to resolve dependencies" }
+          raise Shards::Error.new("Failed to resolve dependencies")
         end
       end
 

src/commands/lock.cr

@@ -36,7 +36,7 @@ module Shards
           solver.each_conflict do |message|
             Shards.logger.warn { "Conflict #{message}" }
           end
-          Shards.logger.error { "Failed to resolve dependencies" }
+          raise Shards::Error.new("Failed to resolve dependencies")
         end
       end
 

src/commands/outdated.cr

@@ -30,7 +30,7 @@ module Shards
           solver.each_conflict do |message|
             Shards.logger.warn { "Conflict #{message}" }
           end
-          Shards.logger.error { "Failed to resolve dependencies" }
+          raise Shards::Error.new("Failed to resolve dependencies")
         end
       end
 

src/commands/update.cr

@@ -27,7 +27,7 @@ module Shards
           solver.each_conflict do |message|
             Shards.logger.warn { "Conflict #{message}" }
           end
-          Shards.logger.error { "Failed to resolve dependencies" }
+          raise Shards::Error.new("Failed to resolve dependencies")
         end
       end