Added sensible @discardableResult attributes for ConstraintMaker public functions

Source/ConstraintMakerEditable.swift

@@ -30,20 +30,24 @@
 
 public class ConstraintMakerEditable: ConstraintMakerPriortizable {
 
+    @discardableResult
     public func multipliedBy(_ amount: ConstraintMultiplierTarget) -> ConstraintMakerEditable {
         self.description.multiplier = amount
         return self
     }
     
+    @discardableResult
     public func dividedBy(_ amount: ConstraintMultiplierTarget) -> ConstraintMakerEditable {
         return self.multipliedBy(1.0 / amount.constraintMultiplierTargetValue)
     }
     
+    @discardableResult
     public func offset(_ amount: ConstraintOffsetTarget) -> ConstraintMakerEditable {
         self.description.constant = amount
         return self
     }
     
+    @discardableResult
     public func inset(_ amount: ConstraintInsetTarget) -> ConstraintMakerEditable {
         let insets: ConstraintInsets
         

Source/ConstraintMakerPriortizable.swift

@@ -30,19 +30,23 @@
 
 public class ConstraintMakerPriortizable: ConstraintMakerFinalizable {
     
+    @discardableResult
     public func priority(_ amount: ConstraintPriorityTarget) -> ConstraintMakerFinalizable {
         self.description.priority = amount
         return self
     }
     
+    @discardableResult
     public func priorityRequired() -> ConstraintMakerFinalizable {
         return self.priority(1000)
     }
     
+    @discardableResult
     public func priorityHigh() -> ConstraintMakerFinalizable {
         return self.priority(750)
     }
     
+    @discardableResult
     public func priorityMedium() -> ConstraintMakerFinalizable {
         #if os(iOS) || os(tvOS)
             return self.priority(500)
@@ -51,6 +55,7 @@ public class ConstraintMakerPriortizable: ConstraintMakerFinalizable {
         #endif
     }
     
+    @discardableResult
     public func priorityLow() -> ConstraintMakerFinalizable {
         return self.priority(250)
     }

Source/ConstraintMakerRelatable.swift

@@ -67,14 +67,17 @@ public class ConstraintMakerRelatable {
         return editable
     }
     
+    @discardableResult
     public func equalTo(_ other: ConstraintRelatableTarget, _ file: String = #file, _ line: UInt = #line) -> ConstraintMakerEditable {
         return self.relatedTo(other, relation: .equal, file: file, line: line)
     }
     
+    @discardableResult
     public func lessThanOrEqualTo(_ other: ConstraintRelatableTarget, _ file: String = #file, _ line: UInt = #line) -> ConstraintMakerEditable {
         return self.relatedTo(other, relation: .lessThanOrEqual, file: file, line: line)
     }
     
+    @discardableResult
     public func greaterThanOrEqualTo(_ other: ConstraintRelatableTarget, _ file: String = #file, line: UInt = #line) -> ConstraintMakerEditable {
         return self.relatedTo(other, relation: .greaterThanOrEqual, file: file, line: line)
     }