Fix failures with EditLine

On macOS with EditLine:
```
$ ruby -r readline -e 'Readline.readline("> "); p Readline::VERSION' < /dev/null
"EditLine wrapper"
```

On Linux with GNU readline:
```
$ ruby -r readline -e 'Readline.readline("> "); p Readline::VERSION' < /dev/null
> "8.0"
```

spec/bundler/commands/info_spec.rb

@@ -165,7 +165,7 @@ RSpec.describe "bundle info" do
       G
 
       bundle "info rac"
-      expect(out).to eq "1 : rack\n2 : rack-obama\n0 : - exit -\n>"
+      expect(out).to match(/\A1 : rack\n2 : rack-obama\n0 : - exit -(\n>)?\z/)
     end
   end
 

spec/bundler/commands/show_spec.rb

@@ -173,7 +173,7 @@ RSpec.describe "bundle show", :bundler => "< 3" do
       G
 
       bundle "show rac"
-      expect(out).to eq "1 : rack\n2 : rack-obama\n0 : - exit -\n>"
+      expect(out).to match(/\A1 : rack\n2 : rack-obama\n0 : - exit -(\n>)?\z/)
     end
   end