Fix language identification of .ts files

[ajlai]

This is a nitpicky fix for Github misidentifying index.ts as a javascript file:
.

I tested with linguist locally (https://github.com/github/linguist#application-usage) to confirm that this change fixes the issue.

[coveralls]

Pull Request Test Coverage Report for Build 87

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 10.56%

---

Totals
Change from base Build 86:	0.0%
Covered Lines:	93
Relevant Lines:	658

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 87

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 10.56%

---

Totals
Change from base Build 86:	0.0%
Covered Lines:	93
Relevant Lines:	658

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 87

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 10.56%

---

Totals
Change from base Build 86:	0.0%
Covered Lines:	93
Relevant Lines:	658

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 87

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 10.56%

---

Totals
Change from base Build 86:	0.0%
Covered Lines:	93
Relevant Lines:	658

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 87

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 10.56%

---

Totals
Change from base Build 86:	0.0%
Covered Lines:	93
Relevant Lines:	658

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 87

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 10.56%

---

Totals
Change from base Build 86:	0.0%
Covered Lines:	93
Relevant Lines:	658

---

💛 - Coveralls

[grant]

Thanks!
The reason why the project was ID'd as Node was because of the shebang (#!/usr/bin/env node).