Update resolvers of install/shake.yaml

Author: jneira

install/shake.yaml

@@ -1,7 +1,7 @@
 # Used to provide a different environment for the shake build script
-resolver: lts-13.19 # last lts with GHC 8.6.5
-# resolver: nightly-2020-01-31 # GHC 8.8.2
-# resolver: nightly-2020-01-21 # last nightly GHC 8.8.1
+resolver: lts-14.27 # last lts GHC 8.6.5
+# resolver: lts-15.7 # lts GHC 8.8.3
+# resolver: lts-15.3 # last lts GHC 8.8.2
 # resolver: lts-13.19 # last lts GHC 8.6.4
 # resolver: lts-12.26 # last lts GHC 8.4.4
 # resolver: lts-12.14 # last lts GHC 8.4.3