Update issue templates

.github/ISSUE_TEMPLATE/methylome-request.md

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+---
+name: Methylome request
+about: Suggest a public methylome to add to methbase
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**What are the NCBI SRA accession numbers for corresponding studies?**
+This should begin with SRP, ERP or DRP. Ex. SRP000996
+
+**What species are involved?**
+Please note that not all species can be supported. Those already available through the UCSC Genome Browser are more easily supported.
+
+**What is the protocol used to generate the data?**
+The important things to note: WGBS, MethylC-seq, RRBS, PBAT, RPBAT, EM-seq, etc.
+
+**Additional context**
+Add any other information that might help towards the decision on whether the methylome(s) can be included.