Remove triage-me label from issue templates. (#1865)

Author: dinooliva

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,7 +1,7 @@
 ---
 name: Bug report
 about: Create a report to help us improve.
-labels: bug, triage-me
+labels: bug
 ---
 
 Please answer these questions before submitting a bug report.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,7 +1,7 @@
 ---
 name: Feature request
 about: Suggest an idea for this project.
-labels: feature-request, triage-me
+labels: feature-request
 ---
 
 **NB:** Before opening a feature request against this repo, consider whether the feature should be available across all languages in the OpenCensus libraries. If so, please [open an issue on opencensus-specs](https://github.com/census-instrumentation/opencensus-specs/issues/new) first.