Update issue templates

.github/ISSUE_TEMPLATE/issue-template.md

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+---
+name: Issue Template
+about: Describe this issue template's purpose here.
+
+---
+
+# Issue Template:
+
+### Describe issue including what OS you are using
+
+_i.e. I'm using MacOS Sierra_
+
+### Describe what version of N you have
+_i.e. n --version output: 2.1.4_
+
+
+### Describe how you installed N
+
+* _i.e. npm install -g n_
+* _i.e. make install_
+
+### Steps to reproduce issue _1.2.3_
+_i.e._
+1. n latest
+2. couldn't pull latest from source
+
+### Describe the results you received
+
+_i.e. blank screen_
+### Describe the results you expected
+
+_i.e. I was supposed to see the latest being pulled from source_
+
+
+### What version of npm you are using
+
+_i.e. npm --version output: 4.0.5_
+
+### Additional information you deem important (e.g. issue happens only occasionally):
+
+* Output of `which n:`
+* Output of `node -v:`
+
+#### (paste your output here)