diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,13 @@
 `slist` uses [PVP Versioning][1].
 The changelog is available [on GitHub][2].
 
+## 0.1.1.0 — Apr 18, 2020
+
+* Fix `mconcat` for `Slist` `Monoid` instance.
+* [#25](https://github.com/vrom911/slist/issues/25):
+  Support GHC-8.10.
+* Update to GHC-8.8.3 from GHC-8.8.1.
+
 ## 0.1.0.0
 
 * [#13](https://github.com/vrom911/slist/issues/13):
@@ -17,7 +24,7 @@
   (by @waynee95)
 * Make `dropWhile` work better on infinite lists.
   (by @chshersh)
-* Support GHC-8.6.5 instead os GHC-8.6.3.
+* Support GHC-8.6.5 instead of GHC-8.6.3.
 * [#6](https://github.com/vrom911/slist/issues/6):
   Build with Stack.
 
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,5 +1,6 @@
 # slist
 
+[![GitHub CI](https://github.com/vrom911/slist/workflows/CI/badge.svg)](https://github.com/vrom911/slist/actions)
 [![Build status](https://img.shields.io/travis/vrom911/slist.svg?logo=travis)](https://travis-ci.org/vrom911/slist)
 [![Hackage](https://img.shields.io/hackage/v/slist.svg?logo=haskell)](https://hackage.haskell.org/package/slist)
 [![Stackage LTS](http://stackage.org/package/slist/badge/lts)](http://stackage.org/lts/package/slist)
diff --git a/slist.cabal b/slist.cabal
--- a/slist.cabal
+++ b/slist.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.4
 name:                slist
-version:             0.1.0.0
+version:             0.1.1.0
 synopsis:            Sized list
 description:         This package implements @Slist@ data structure that stores the size
                      of the list along with the list itself.
@@ -10,7 +10,7 @@
 license-file:        LICENSE
 author:              Veronika Romashkina
 maintainer:          vrom911@gmail.com
-copyright:           2019 Veronika Romashkina
+copyright:           2019-2020 Veronika Romashkina
 category:            Data Structures, List
 build-type:          Simple
 extra-doc-files:     README.md
@@ -18,14 +18,15 @@
 tested-with:         GHC == 8.2.2
                    , GHC == 8.4.4
                    , GHC == 8.6.5
-                   , GHC == 8.8.1
+                   , GHC == 8.8.3
+                   , GHC == 8.10.1
 
 source-repository head
   type:                git
   location:            https://github.com/vrom911/slist.git
 
 common common-options
-  build-depends:       base >= 4.10.1.0 && < 4.14
+  build-depends:       base >= 4.10.1.0 && < 4.15
 
   ghc-options:         -Wall
                        -Wincomplete-uni-patterns
@@ -37,6 +38,8 @@
   if impl(ghc >= 8.8.1)
     ghc-options:       -Wmissing-deriving-strategies
                        -Werror=missing-deriving-strategies
+  if impl(ghc >= 8.10.1)
+    ghc-options:       -Wunused-packages
 
   default-extensions:  ConstraintKinds
                        DeriveGeneric
@@ -61,25 +64,11 @@
   exposed-modules:     Slist
                          Slist.Size
 
-test-suite slist-test
-  import:              common-options
-  type:                exitcode-stdio-1.0
-  hs-source-dirs:      test
-  main-is:             Spec.hs
-
-  build-depends:       slist
-
-  ghc-options:         -threaded
-                       -rtsopts
-                       -with-rtsopts=-N
-
 test-suite slist-doctest
   import:              common-options
   type:                exitcode-stdio-1.0
   hs-source-dirs:      test
   main-is:             Doctest.hs
-
   build-depends:       doctest
                      , Glob
-
   ghc-options:         -threaded
diff --git a/src/Slist.hs b/src/Slist.hs
--- a/src/Slist.hs
+++ b/src/Slist.hs
@@ -6,7 +6,7 @@
 {- HLINT ignore "Use mconcat" -}
 
 {- |
-Copyright:  (c) 2019 vrom911
+Copyright:  (c) 2019-2020 Veronika Romashkina
 License:    MPL-2.0
 Maintainer: Veronika Romashkina <vrom911@gmail.com>
 
@@ -266,7 +266,7 @@
       where
         -- foldr :: (a -> ([a], Size) -> ([a], Size)) -> ([a], Size) -> [Slist a] -> ([a], Size)
         f :: Slist a -> ([a], Size) -> ([a], Size)
-        f (Slist l s) (xL, !xS) = (xL ++ l, s + xS)
+        f (Slist l s) (xL, !xS) = (l ++ xL, s + xS)
     {-# INLINE mconcat #-}
 
 instance Functor Slist where
diff --git a/src/Slist/Size.hs b/src/Slist/Size.hs
--- a/src/Slist/Size.hs
+++ b/src/Slist/Size.hs
@@ -1,9 +1,15 @@
--- | Lists size representation
+{- |
+Copyright:  (c) 2019-2020 Veronika Romashkina
+License:    MPL-2.0
+Maintainer: Veronika Romashkina <vrom911@gmail.com>
 
+Lists size representation.
+-}
+
 module Slist.Size
-       ( Size (..)
-       , sizes
-       ) where
+    ( Size (..)
+    , sizes
+    ) where
 
 
 {- | Data type that represents lists size/lengths.
diff --git a/test/Spec.hs b/test/Spec.hs
deleted file mode 100644
--- a/test/Spec.hs
+++ /dev/null
@@ -1,4 +0,0 @@
-module Main (main) where
-
-main :: IO ()
-main = putStrLn ("Test suite not yet implemented" :: String)