Changelog for lambdabot-5.3

lambdabot 5.3 * support ghc-8.8 (#186, #187) * fix Setup.hs files for Cabal 3.0 (#188, #189) * fix alpha renaming in @pl * fix variable capture in @unpl lambdabot 5.2 * remove stats plugin (for network-3.0 support) lambdabot 5.1.0.4 * support ghc-8.6 (#174, #175) * @pl timeout works again (#173) lambdabot 5.1.0.2 * support ghc-8.4 * #155, #163, #164, #168, #169, #170 lambdabot 5.1.0.1 * support ghc-8.0 * support haskell-src-exts 1.18+ * better oeis output * #141, #149 lambdabot 5.1 * support for dependent-sum 0.3 (#130) * IRC reconnect support (#125, by Nikolay Amiantov) * unmtl parsing fix (#129, by Daniel Wagner) * #131, #138, #139, #140, #142, #143 lambdabot 5.0.3 * compatibility with ghc-7.10: relax utf8-string upper bound * numerous bugfixes (#121, #122, #123, #117, #98) lambdabot 5.0.2.2 * update Changelog lambdabot 5.0.2.1 * use QuickCheck-safe for @check command * ship ghc version specific Pristen.hs files * the dict plugin no longer looks up more than one word at a time lambdabot 5.0.1 * update to monad-control-1.0 * if ./State/ exists, then state files are stored there even if a corresponding file exists in ~/.lambdabot/State