Add changelog entry for 8.1.0, update version in Podspec

Author: Thomvis

BrightFutures.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name = 'BrightFutures'
-  s.version = '8.0.1'
+  s.version = '8.1.0'
   s.license = 'MIT'
   s.summary = 'Write great asynchronous code in Swift using futures and promises'
   s.homepage = 'https://github.com/Thomvis/BrightFutures'

CHANGELOG.md

@@ -1,3 +1,10 @@
+# 8.1.0
+- Adds support for Swift 5.4 and Xcode 12.5. ([#216](https://github.com/Thomvis/BrightFutures/pull/216) & [#218](https://github.com/Thomvis/BrightFutures/pull/218), thanks [MagFer](https://github.com/MagFer), [MultiColourPixel](https://github.com/MultiColourPixel) & [paiv](https://github.com/paiv))
+- Adds `Future.init(error: E, delay: DispatchTimeInterval)` ([#215](https://github.com/Thomvis/BrightFutures/pull/215), thanks [RomanPodymov](https://github.com/RomanPodymov))
+- Fixed casing of various global constants. ([#176](https://github.com/Thomvis/BrightFutures/pull/176), thanks [Sajjon](https://github.com/Sajjon))
+- Deprecated `NoValue` in favor of `Never`
+
+
 # 8.0.1
 - Fixes an issue that broke Swift Package Manager support. ([#208](https://github.com/Thomvis/BrightFutures/pull/208), thanks [slessans](https://github.com/slessans)!)