Make 1990/tbr alt version that uses fgets not gets

This is so that the warning about gets() is not interspersed with the
initial output of the program (see below). I do want to note that if one
sends EOF it will segfault so to exit one should do ctrl-c (for
instance) (exit never worked). I will look at fixing that fault later on
to match the original code but this is good for now. When fixed (low
priority though) I will consider making the gets() version the alt but
probably not (I guess time will tell).

As for the interspersed output it looks like:

    $ warning: this program uses gets(), which is unsafe.
    # cursor is here

At the cursor I can either hit enter to get another prompt or I can
input a command but this is not immediately obvious.

Updated .gitignore to have tbr.alt.

1990/tbr/README.md

@@ -22,11 +22,27 @@ modern computers; `exit(3)` returns void but the function was used in a binary
 expression so this would not even compile. Thank you Cody for your assistance!
 
 
+## Alternative code:
+
+Cody also made a version that uses `fgets()` instead of `gets()` so one would
+not get a warning that was interspersed with the output of the initial prompt
+when running the program, to make it both safer and to have a better look. Thank
+you Cody!
+
+To build try:
+
+	make alt
+
+NOTE: it will segfault if you send EOF; to quit send an interrupt like ctrl-c.
+Cody will look at this later.
+
 ## To run:
 
 	./tbr
 	# enter some shell commands
 
+NOTE: globs do not work with this entry. Why?
+
 ## Try:
 
 	./tbr
@@ -37,6 +53,7 @@ expression so this would not even compile. Thank you Cody for your assistance!
 	vi tbr.c
 	# then figure out how to exit vi :-)
 
+What happens if you try using `cd -` to return to previous directory?
 
 ## Judges' comments:
 
@@ -64,7 +81,7 @@ of the program which we include below:
 
 
 
-## Author's comments
+## Author's comments:
 
 Rot13: