Fix path in test for deps.jl

[andreasnoack]

So "../deps/deps.jl", of course, has a different meaning depending on whether it is used in include or isfile. However, the tests are run from within the test directory so this wasn't caught by CI.

Fixed #21.

[coveralls]

Pull Request Test Coverage Report for Build 43

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 94.091%

---

Files with Coverage Reduction	New Missed Lines	%
src/Arpack.jl	3	98.96%

Totals
Change from base Build 40:	-0.1%
Covered Lines:	207
Relevant Lines:	220

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 45

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 94.196%

---

Totals
Change from base Build 40:	0.0%
Covered Lines:	211
Relevant Lines:	224

---

💛 - Coveralls

[codecov-io]

Codecov Report

Merging #22 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #22   +/-   ##
=======================================
  Coverage   95.11%   95.11%           
=======================================
  Files           2        2           
  Lines         225      225           
=======================================
  Hits          214      214           
  Misses         11       11

Impacted Files	Coverage Δ
src/Arpack.jl	97.14% <ø> (ø)	⬆️

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