Delete ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

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-<!--
-If you are reporting a new issue, make sure that we do not have any duplicates
-already open. You can ensure this by searching the issue list for this
-repository. If there is a duplicate, please close your issue and add a comment
-to the existing issue instead.
-
-Use the commands below to provide key information from your environment:
-You do NOT have to include this information if this is a FEATURE REQUEST
--->
-
-**Description**
-
-<!--
-Briefly describe the problem you are having in a few paragraphs.
--->
-
-**Steps to reproduce the issue:**
-1.
-2.
-3.
-
-**Describe the results you received:**
-
-**Describe the results you expected:**
-
-**Output of `go version`:**
-
-```text
-(paste your output here)
-```
-
-**Excelize version or commit ID:**
-
-```text
-(paste here)
-```
-
-**Environment details (OS, Microsoft Excel™ version, physical, etc.):**