Update DOI badge to lock to correct version

README.md

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-# Phase Calculator Plugin [![DOI](https://zenodo.org/badge/134900173.svg)](https://zenodo.org/badge/latestdoi/134900173)
+# Phase Calculator Plugin [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.2548723.svg)](https://doi.org/10.5281/zenodo.2548723)
 
 A plugin for the [Open Ephys GUI](https://github.com/open-ephys/plugin-GUI) to estimate the phase of inputs within a specified passband in real time. Its primary purpose is to enable closed-loop stimulation, typically in combination with the [Crossing Detector](https://github.com/tne-lab/crossing-detector) and either the Pulse Pal or an external stimulation system that receives ZeroMQ events (for example, the LabVIEW implementation [here](https://github.com/tne-lab/closed-loop-stim)). It can also output the magnitude or imaginary component of the band-limited analytic signal instead of the phase. (The "PH+MAG" mode outputs both phase and magnitude, in separate channels.) Finally, the visualization tab or window can receive TTL events and display the delayed but precise phase of a specified input at the event onset samples in a rose plot. This allows real-time monitoring of stimulation accuracy.