fix(deps): Downgrade typescript version

Author: EndyKaufman

.gitignore

@@ -1,25 +1,24 @@
-*-debug.log
-*-error.log
-/.nyc_output
-/dist
-/lib
-/package-lock.json
-/tmp
-node_modules
-# IDEs and editors
-/.idea
-.project
-.classpath
-.c9/
-*.launch
-.settings/
-*.sublime-workspace
-
-# IDE - VSCode
-.vscode/*
-!.vscode/settings.json
-!.vscode/tasks.json
-!.vscode/launch.json
-!.vscode/extensions.json
-/*.tgz
-/.travis.yml
+*-debug.log
+*-error.log
+/.nyc_output
+/dist
+/lib
+/tmp
+node_modules
+# IDEs and editors
+/.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+/*.tgz
+/.travis.yml