Pointed GHActions badges to master branch (#625)

README.md

@@ -6,7 +6,7 @@ hvPlot <img src="/doc/_static/logo.png" width="50" height="50">
 
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-| Build Status | [![Build Status](https://github.com/holoviz/hvplot/workflows/tests/badge.svg)](https://github.com/holoviz/hvplot/actions?query=workflow%3Atests) |
+| Build Status | [![Build Status](https://github.com/holoviz/hvplot/workflows/tests/badge.svg?query=branch%3Amaster)](https://github.com/holoviz/hvplot/actions?query=workflow%3Atests+branch%3Amaster) |
 | Coverage | [![Coverage Status](https://coveralls.io/repos/github/holoviz/hvplot/badge.svg?branch=master)](https://coveralls.io/github/holoviz/hvplot?branch=master) |
 | Latest dev release | [![Github tag](https://img.shields.io/github/tag/holoviz/hvplot.svg?label=tag&colorB=11ccbb)](https://github.com/holoviz/hvplot/tags) |
 | Latest release | [![Github release](https://img.shields.io/github/release/holoviz/hvplot.svg?label=tag&colorB=11ccbb)](https://github.com/holoviz/hvplot/releases) [![PyPI version](https://img.shields.io/pypi/v/hvplot.svg?colorB=cc77dd)](https://pypi.python.org/pypi/hvplot) [![hvplot version](https://img.shields.io/conda/v/pyviz/hvplot.svg?colorB=4488ff&style=flat)](https://anaconda.org/pyviz/hvplot) [![conda-forge version](https://img.shields.io/conda/v/conda-forge/hvplot.svg?label=conda%7Cconda-forge&colorB=4488ff)](https://anaconda.org/conda-forge/hvplot) [![defaults version](https://img.shields.io/conda/v/anaconda/hvplot.svg?label=conda%7Cdefaults&style=flat&colorB=4488ff)](https://anaconda.org/anaconda/hvplot) |