dev: regenerate README.md after #630

Also, output help for the new option in a more compact way.

README.md

@@ -460,6 +460,14 @@ Flags:
   -c, --config PATH                 Read config from file path PATH
       --no-config                   Don't read config
       --skip-dirs strings           Regexps of directories to skip
+      --skip-dirs-use-default       Use or not use default excluded directories:
+                                      - (^|/)vendor($|/)
+                                      - (^|/)third_party($|/)
+                                      - (^|/)testdata($|/)
+                                      - (^|/)examples($|/)
+                                      - (^|/)Godeps($|/)
+                                      - (^|/)builtin($|/)
+                                     (default true)
       --skip-files strings          Regexps of files to skip
   -E, --enable strings              Enable specific linter
   -D, --disable strings             Disable specific linter

pkg/commands/run.go

@@ -42,11 +42,9 @@ func getDefaultIssueExcludeHelp() string {
 func getDefaultDirectoryExcludeHelp() string {
 	parts := []string{"Use or not use default excluded directories:"}
 	for _, dir := range packages.StdExcludeDirRegexps {
-		parts = append(parts,
-			fmt.Sprintf("  - %s", color.YellowString(dir)),
-			"",
-		)
+		parts = append(parts, fmt.Sprintf("  - %s", color.YellowString(dir)))
 	}
+	parts = append(parts, "")
 	return strings.Join(parts, "\n")
 }