🌐 Added missing period to symptoms introduction string

A missing period at the end of the 'symptoms_introduction' string in the
 values/strings.xml file has been added.

Signed-off-by: Leonardo Colman Lopes <[email protected]>

app/src/main/res/values/strings.xml

@@ -28,7 +28,7 @@
     <string name="usage">Usage</string>
     <string name="symptoms">Symptoms</string>
     <string name="stats">Stats</string>
-    <string name="symptoms_introduction">A study from Budney et al. from the University of Vermont established how withdrawal symptoms affect and decay on cannabis users. Below you\'ll see an estimate of your current situation based on your last use date</string>
+    <string name="symptoms_introduction">A study from Budney et al. from the University of Vermont established how withdrawal symptoms affect and decay on cannabis users. Below you\'ll see an estimate of your current situation based on your last use date.</string>
     <string name="hit_timer">Hit Timer</string>
     <string name="start">Start</string>
     <string name="reset">Reset</string>