Update tools versions (#79)

Author: kmahar

.evergreen/install-tools.sh

@@ -39,10 +39,10 @@ swiftenv local $SWIFT_VERSION
 
 if [ $1 == "swiftlint" ]
 then
-    build_from_gh swiftlint https://github.com/realm/SwiftLint "0.44.0"
+    build_from_gh swiftlint https://github.com/realm/SwiftLint "0.46.3"
 elif [ $1 == "swiftformat" ]
 then
-    build_from_gh swiftformat https://github.com/nicklockwood/SwiftFormat "0.48.11"
+    build_from_gh swiftformat https://github.com/nicklockwood/SwiftFormat "0.49.4"
 else
     echo Missing/unknown install option: "$1"
 fi