Add colons to non-verb categories in cli.display.

src/nimble.nim

@@ -517,7 +517,8 @@ proc installFromDir(dir: string, latest: bool, options: Options,
   result.paths.add pkgDestDir
   result.pkg = pkgInfo
 
-  display(pkgInfo.name, " installed successfully.", priority = HighPriority)
+  display("Success:", pkgInfo.name & " installed successfully.",
+          Success, HighPriority)
 
 proc getNimbleTempDir(): string =
   ## Returns a path to a temporary directory.

src/nimblepkg/cli.nim

@@ -95,7 +95,7 @@ proc displayTip*() =
   if globalCLI.suppressionCount > 0:
     let msg = "$1 messages have been suppressed, use --verbose to show them." %
              $globalCLI.suppressionCount
-    display("Tip", msg, Warning, HighPriority)
+    display("Tip:", msg, Warning, HighPriority)
 
 proc setVerbosity*(level: Priority) =
   globalCLI.level = level

src/nimblepkg/packageparser.nim

@@ -246,7 +246,7 @@ proc getInstalledPkgs*(libsDir: string, options: Options):
     let (name, version) = getNameVersion(path)
     return tmplt % [name, version, msg]
 
-  display("Loading", "list of installed packages", priority = HighPriority)
+  display("Loading", "list of installed packages", priority = MediumPriority)
 
   result = @[]
   for kind, path in walkDir(libsDir):