update recommended snapshots, make GHC8/lts-7 the default

Makefile

@@ -75,7 +75,7 @@ GHCI=ghci #-package ghc-datasize #-package ghc-heap-view
 # CABAL=cabal
 # CABALINSTALL=cabal install -w $(GHC)
 STACK=stack
-#STACK=stack --stack-yaml=stack-ghc8.yaml
+#STACK=stack --stack-yaml=stack-ghc7.yaml
 
 # -j16 sometimes gives "commitAndReleaseBuffer: resource vanished (Broken pipe)" but seems harmless
 SHELLTESTOPTS=--execdir -- -j16 --hide-successes

stack-ghc7.yaml

@@ -0,0 +1,17 @@
+# Use this config if you prefer to build with GHC 7 & stackage lts-6
+# for some reason.
+# $ stack --stack-yaml stack-ghc7.yaml install
+
+# Some older and newer lts-6 snapshots will also work here.
+resolver: lts-6.22
+
+packages:
+- hledger-lib
+- hledger
+- hledger-ui
+- hledger-web
+- hledger-api
+
+extra-deps:
+- brick-0.8
+- megaparsec-5.0.1

stack-ghc8.yaml

@@ -1,22 +0,0 @@
-# $ stack --stack-yaml stack-ghc8.yaml install
-
-resolver: lts-7.0
-
-packages:
-- hledger-lib
-- hledger
-- hledger-ui
-- hledger-web
-- hledger-api
-
-flags:
-
-extra-deps:
-# hledger-ui
-- brick-0.8
-- text-zipper-0.4
-- vty-5.7.1
-# hledger-web
-- wai-handler-launch-3.0.2.1
-
-# cf https://github.com/commercialhaskell/stack/wiki/stack.yaml

stack.yaml

@@ -1,5 +1,5 @@
-# this or a newer snapshot is suggested (hledger-api/servant/aeson requires > lts-5)
-resolver: lts-6.18
+# some older and newer lts-7 snapshots will also work here
+resolver: lts-7.4
 
 packages:
 - hledger-lib
@@ -8,10 +8,12 @@ packages:
 - hledger-web
 - hledger-api
 
-#flags:
-
 extra-deps:
+# for hledger-ui:
 - brick-0.8
-- megaparsec-5.0.1
+- text-zipper-0.4
+- vty-5.7.1
+# for hledger-web:
+- wai-handler-launch-3.0.2.1
 
-# https://docs.haskellstack.org/en/stable/yaml_configuration/
+# cf https://github.com/commercialhaskell/stack/wiki/stack.yaml