Changed README according to the latest commit

Demonstrates some warnings that you may see

README.md

@@ -5,12 +5,30 @@ This bot runs as ``bisectable`` on ``#perl6``.
 Currently ``AlexDaniel`` is maintaining it.
 
 ## Usage examples
-
 ```
 <AlexDaniel> bisect: exit 1 if (^∞).grep({ last })[5] // 0 == 4 # RT 128181
 <bisectable> AlexDaniel: (2016-03-18) https://github.com/rakudo/rakudo/commit/6d120ca
 ```
 
+Garbage in, rainbows out. Attempts to guess what you have meant:
+```
+<AlexDaniel> say (^∞).grep({ last })[5] # same but without proper exit codes
+<bisectable> AlexDaniel: exit code is 0 on both starting points, bisecting by using the output
+<bisectable> AlexDaniel: (2016-03-18) https://github.com/rakudo/rakudo/commit/6d120ca
+```
+
+```
+<AlexDaniel> bisect: class A { has $.wut = [] }; my $a = A.new; $a.wut = [1,2,3]
+<bisectable> AlexDaniel: exit code on a “good” revision is 1 (which is bad), bisecting with inverted logic
+<bisectable> AlexDaniel: (2016-03-02) https://github.com/rakudo/rakudo/commit/fdd37a9
+```
+
+```
+<AlexDaniel> bisect: exit 42
+<bisectable> AlexDaniel: on both starting points the exit code is 42 and the output is identical as well
+```
+
+More examples:
 ```
 <moritz> bisect: try { NaN.Rat == NaN; exit 0 }; exit 1
 <bisectable> moritz: (2016-05-02) https://github.com/rakudo/rakudo/commit/e2f1fa7
@@ -23,13 +41,16 @@ Currently ``AlexDaniel`` is maintaining it.
 
 ```
 <AlexDaniel> bisectable: help
-<bisectable> AlexDaniel: Like this: bisect: good=v6.c bad=HEAD exit 1 if (^∞).grep({ last })[5] // 0 == 4 # RT 128181
+<bisectable> AlexDaniel: Like this: bisect: good=2015.12 bad=HEAD exit 1 if (^∞).grep({ last })[5] // 0 == 4 # RT 128181
 ```
 
-Defaults to ``good=v6.c`` and ``bad=HEAD``.
+```
+<AlexDaniel> bisect: good=2016.03 bad 2016.02 say (^∞).grep({ last })[5] # swapped good and bad revisions
+<bisectable> AlexDaniel: exit code is 0 on both starting points, bisecting by using the output
+<bisectable> AlexDaniel: “bisect run” failure
+```
 
-Garbage in, garbage out. Currently does not check if your code snippet results
-in a different output on starting points.
+Defaults to ``good=2015.12`` and ``bad=HEAD``.
 
 ## Installation
 Run ``new-commits`` script periodically to process new commits.