Fix README

README.md

@@ -1,20 +1,27 @@
 # python-ctd
 
-[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.11396.svg)](https://doi.org/10.5281/zenodo.11396) [![Build Status](https://travis-ci.org/pyoceans/python-ctd.svg?branch=master)](https://travis-ci.org/pyoceans/python-ctd) [![PyPI](https://img.shields.io/pypi/v/ctd.svg?style=plastic)](https://pypi.python.org/pypi/ctd) [![Build status](https://ci.appveyor.com/api/projects/status/m1wxtsb8gpm96i53?svg=true)](https://ci.appveyor.com/project/ocefpaf/python-ctd) [![License](http://img.shields.io/badge/license-BSD--3--Clause-blue.svg?style=flat)](https://github.com/pyoceans/python-ctd/blob/master/LICENSE.txt)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.11396.svg)](https://doi.org/10.5281/zenodo.11396)
+[![Tests](https://github.com/pyoceans/python-ctd/actions/workflows/tests.yml/badge.svg)](https://github.com/pyoceans/python-ctd/actions/workflows/tests.yml)
+[![PyPI](https://img.shields.io/pypi/v/ctd.svg?style=plastic)](https://pypi.python.org/pypi/ctd)
+[![License](https://img.shields.io/badge/license-BSD--3--Clause-blue.svg?style=flat)](https://github.com/pyoceans/python-ctd/blob/main/LICENSE.txt)
 
 Tools to load hydrographic data as pandas DataFrame with some handy methods for
 data pre-processing and analysis
 
-This module can load [SeaBird CTD (CNV)](http://www.seabird.com/software/SBEDataProcforWindows.htm),
-[Sippican XBT (EDF)](http://www.sippican.com/),
-and [Falmouth CTD (ASCII)](http://www.falmouth.com/) formats.
+This module can load [SeaBird CTD (CNV)](https://www.seabird.com/software/SBEDataProcforWindows.htm),
+[Sippican XBT (EDF)](https://www.lockheedmartin.com/en-us/products/oceanographic-instrumentation.html),
+and [Falmouth CTD (ASCII)](https://www.falmouth.com/) formats.
 
 ## Quick intro
 
+You can install the CTD package with
+
 ```shell
 conda install ctd --channel conda-forge
 ```
 
+or
+
 ```shell
 pip install ctd
 ```
@@ -33,9 +40,9 @@ down, up = ctd.from_cnv(fname).split()
 ax = down['t090C'].plot_cast()
 ```
 
-![Bad Processing](https://raw.githubusercontent.com/pyoceans/python-ctd/master/docs/readme_01.png)
+![Bad Processing](https://raw.githubusercontent.com/pyoceans/python-ctd/main/docs/readme_01.png)
 
-We can do [better](http://www.go-ship.org/Manual/McTaggart_et_al_CTD.pdf):
+We can do [better](https://www.go-ship.org/Manual/McTaggart_et_al_CTD.pdf):
 
 ```python
 temperature = down['t090C']
@@ -56,4 +63,4 @@ ax.set_ylabel('Pressure (dbar)')
 ax.set_xlabel('Temperature (°C)')
 ```
 
-![Good Processing](https://raw.githubusercontent.com/pyoceans/python-ctd/master/docs/readme_02.png)
+![Good Processing](https://raw.githubusercontent.com/pyoceans/python-ctd/main/docs/readme_02.png)