Updated podspec version

Author: Marxon13

M13Checkbox.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "M13Checkbox"
-  s.version      = "3.1.2"
+  s.version      = "3.1.3"
   s.summary      = "A beautiful, customizable, extendable, animated checkbox for iOS."
 
   s.description  = <<-DESC

M13Checkbox.xcodeproj/project.pbxproj

@@ -71,7 +71,6 @@
 
 /* Begin PBXFileReference section */
 		142C71FD96ACA2685D246CF8 /* Pods_M13Checkbox.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_M13Checkbox.framework; sourceTree = BUILT_PRODUCTS_DIR; };
-		43242B531DA6D14400C6AF91 /* M13Checkbox.podspec */ = {isa = PBXFileReference; lastKnownFileType = text; path = M13Checkbox.podspec; sourceTree = "<group>"; };
 		43242B541DA7BC1100C6AF91 /* M13CheckboxAddRemovePathGenerator.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = M13CheckboxAddRemovePathGenerator.swift; path = Sources/Paths/M13CheckboxAddRemovePathGenerator.swift; sourceTree = SOURCE_ROOT; };
 		434D1FF51DABB52300F5A8C8 /* M13CheckboxDisclosurePathGenerator.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = M13CheckboxDisclosurePathGenerator.swift; path = Sources/Paths/M13CheckboxDisclosurePathGenerator.swift; sourceTree = SOURCE_ROOT; };
 		43A4CE6E1E64F86D23A4560F /* Pods-M13Checkbox.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-M13Checkbox.release.xcconfig"; path = "Pods/Target Support Files/Pods-M13Checkbox/Pods-M13Checkbox.release.xcconfig"; sourceTree = "<group>"; };
@@ -184,7 +183,6 @@
 		EA67200D1C7D0296008054BA = {
 			isa = PBXGroup;
 			children = (
-				43242B531DA6D14400C6AF91 /* M13Checkbox.podspec */,
 				EA67202D1C7D02F8008054BA /* Source */,
 				EA96F8FC1CBEB4CC0066C6B7 /* M13Checkbox */,
 				EA6720181C7D0296008054BA /* M13Checkbox Demo */,