README Fixes bug introduced by fixing rst-lit error

Seems like PyPi wont display -a revisions on its first page.
And apparently the rst-linter does not detect malformed underlines.

README.rst

@@ -5,11 +5,11 @@ Program to read eCO_2 and TVOC from the `SGP30 sensor <https://www.sensirion.com
 
 
 Quick usage-example:
--------------------_
+--------------------
 ::
 
-	 from sgp30 import Sgp30
-	 import time
+    from sgp30 import Sgp30
+    import time
     with SMBusWrapper(1) as bus:
         sgp=Sgp30(bus,baseline_filename="/tmp/mySGP30_baseline") #things thing with the baselinefile is dumb and will be changed in the future
         print("resetting all i2c devices")
@@ -18,12 +18,12 @@ Quick usage-example:
         print(sgp.read_serial())
         sgp.init_sgp()
         print(sgp.read_measurements())
-		  print("the SGP30 takes at least 15 seconds to warm up, 12 hours before the readigs become really stable"
-		  for i in range(20):
-			  time.sleep(1)
-			  print(".",end="")
-		  print()
-        print(sgp.read_measurements())
+        print("the SGP30 takes at least 15 seconds to warm up, 12 hours before the readigs become really stable"
+     	  for i in range(20):
+     		  time.sleep(1)
+     		  print(".",end="")
+     	  print()
+           print(sgp.read_measurements())
 
 Features that are known to be missing (listing in rough order of importance):
 -----------------------------------------------------------------------------

setup.py

@@ -11,7 +11,7 @@ with open('LICENSE') as f:
 setup(
     name='sgp30',
     description='Library for reading data from the sensiron SGP30',
-    version='0.1.3-a',
+    version='0.1.4',
     long_description=readme,
     author='Simon Albinsson',
     author_email='pipmon@zinob.se',