Path to julia Appveyor

[CNelias]

it seems the path to Julia has changed in Appveyor, to C:\julia\bin\julia, so the readme should be adapted accordingly.

[coveralls]

Pull Request Test Coverage Report for Build 1420933204

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.5%) to 90.865%

---

Files with Coverage Reduction	New Missed Lines	%
src/codecovio.jl	2	87.38%
src/coveralls.jl	2	94.29%
<!--	Total:	4

Totals
Change from base Build 1363428186:	0.5%
Covered Lines:	189
Relevant Lines:	208

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💛 - Coveralls

[codecov[bot]]

Codecov Report

Merging #329 (f86656d) into master (e22e4fe) will increase coverage by 0.77%. The diff coverage is n/a.

:exclamation: Current head f86656d differs from pull request most recent head 4bb021f. Consider uploading reports for the commit 4bb021f to get more accurate results

@@            Coverage Diff             @@
##           master     #329      +/-   ##
==========================================
+ Coverage   90.09%   90.86%   +0.77%     
==========================================
  Files           2        2              
  Lines         212      208       -4     
==========================================
- Hits          191      189       -2     
+ Misses         21       19       -2     

Impacted Files	Coverage Δ
src/coveralls.jl	94.28% <0.00%> (-1.91%)	:arrow_down:
src/codecovio.jl	87.37% <0.00%> (+3.26%)	:arrow_up:

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