Bump the lower version of base

Author: adithyaov

unicode-transforms.cabal

@@ -81,7 +81,7 @@ library
   hs-source-dirs: .
   ghc-options: -Wall -fwarn-identities -fwarn-incomplete-record-updates -fwarn-incomplete-uni-patterns -fwarn-tabs
   build-depends:
-      base >=4.7 && <5
+      base >=4.8 && <5
     , unicode-data >= 0.1 && <0.2
     , bytestring >=0.9 && <0.12
     , ghc-prim >= 0.2 && < 0.8