update dependencies to latest

remove deprecated ioutils import

remove unnecesary loop

Adding CI for github

Fix issue where no profiles results in a nil pointer exception

doc(README): Run this from directory with `go.mod`

ReportGenerator (4.8) generates a report where links to files collide.
This may be my fault, but if so I have not figured out the correct way
to fix it without resorting to this hack.

Propagate errors up the stack.

merge latest changes for gocover-cobertura

The previous version assumed that files were either in $GOPATH or
$GOROOT. With modules this is no longer the case. This update uses
x/tools/go/packages to find the source root directories.

Signed-off-by: Hang SU <darcy.sh@antfin.com>

The corresponding code is copied from latest golang code, view:
https://github.com/golang/go/blob/master/src/cmd/cover/profile.go#L96



Signed-off-by: Hang SU <darcy.sh@antfin.com>

  -ignore-dirs PATTERN   ignore dirs matching this regexp
  -ignore-files PATTERN  ignore files matching this regexp
  -ignore-gen-files      ignore generated files

Signed-off-by: Maxime Soulé <btik-git@scoubidou.com>

Calculate aggregate stats

Use testdata as-is without gen from template

I'm not an expert on Cobertura, but it seems confusing to have stuff
like:

```
<line number="5" hits="1"></line>
<line number="5" hits="0"></line>
```

I decided to treat this situation in a pessimistic way - i.e.: if the
second entry for a line number is lower than the previous one, then we
update the hit count down; but we never update it up. In other words, if
we ever see a 0 for a line, we mark the line uncovered, even if we
previously saw a 1.

While trying to run `gocover-cobertura` on `testdata/testdata_set.txt`, I noticed that
it's actually a Go template; not actual data; so the tool can't process
it. The template seems to be just to replace `{{.PkgPath}}` with the
current directory. By using `.` instead in that file, it eliminates the
need for a bunch of code for rendering the template (it eliminates
2 stdlib imports, not that it's a big deal)

Before:

```
$ gocover-cobertura < testdata/testdata_set.txt | head -n 18
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE coverage SYSTEM "http://cobertura.sourceforge.net/xml/coverage-04.dtd">
<coverage line-rate="0" branch-rate="0" version="" timestamp="1518632283054" lines-covered="0" lines-valid="0" branches-covered="0" branches-valid="0" complexity="0">
	<sources>
		<source>/usr/local/Cellar/go/1.10rc1/libexec/src</source>
		<source>/Users/abramowi/go/src</source>
	</sources>
	<packages></packages>
</coverage>
```

After:

```
$ gocover-cobertura < testdata/testdata_set.txt | head -n 18
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE coverage SYSTEM "http://cobertura.sourceforge.net/xml/coverage-04.dtd">
<coverage line-rate="0" branch-rate="0" version="" timestamp="1518632265239" lines-covered="0" lines-valid="0" branches-covered="0" branches-valid="0" complexity="0">
	<sources>
		<source>/usr/local/Cellar/go/1.10rc1/libexec/src</source>
		<source>/Users/abramowi/go/src</source>
	</sources>
	<packages>
		<package name="./testdata" line-rate="0" branch-rate="0" complexity="0">
			<classes>
				<class name="-" filename="./testdata/func1.go" line-rate="0" branch-rate="0" complexity="0">
					<methods>
						<method name="Func1" signature="" line-rate="0" branch-rate="0" complexity="0">
							<lines>
								<line number="4" hits="1"></line>
								<line number="5" hits="1"></line>
								<line number="5" hits="0"></line>
								<line number="6" hits="0"></line>
```

README.md: Add coveralls.io badge

Post coverage results to coveralls.io

More test coverage