Updated documentation pyenv init for fish shell comform to readme. (#1703)

libexec/pyenv-init

@@ -70,7 +70,7 @@ if [ -z "$print" ]; then
     echo
     case "$shell" in
     fish )
-      echo 'status --is-interactive; and source (pyenv init -|psub)'
+      echo 'pyenv init - | source'
       ;;
     * )
       echo 'eval "$(pyenv init -)"'

test/init.bats

@@ -53,7 +53,7 @@ OUT
 @test "fish instructions" {
   run pyenv-init fish
   assert [ "$status" -eq 1 ]
-  assert_line 'status --is-interactive; and source (pyenv init -|psub)'
+  assert_line 'pyenv init - | source'
 }
 
 @test "option to skip rehash" {