Add labels to issue templates (#154)

@Firestar99 said the labels were not being added, hopefully this fixes it.

Author: LegNeato

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,8 +1,10 @@
 ---
 name: Bug Report
 about: Report a bug with using rust-gpu.
-title: '(my bug report)'
-labels: 't: bug'
+title: "(my bug report)"
+labels: bug
+assignees: ''
+
 ---
 
 <!-- Thank you for filing a bug report! 🐛 -->

.github/ISSUE_TEMPLATE/enhancement.md

@@ -2,7 +2,9 @@
 name: Enhancement
 about: Propose a minor improvement or feature to the project.
 title: "(My enhancement)"
-labels: "t: enhancement"
+labels: enhancement
+assignees: ''
+
 ---
 
 <!--
@@ -15,4 +17,3 @@ Existing Issues: https://github.com/rust-gpu/rust-gpu/issues?q=is%3Aopen+is%3Ais
 Closed Issues: https://github.com/rust-gpu/rust-gpu/labels/s%3A%20wontfix
 
 -->
-